drm/radeon/btc_dpm: Move 'evergreen_get_pi's prototype to shared header

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/radeon/rv770_dpm.c:62:30: warning: no previous prototype for ‘evergreen_get_pi’ [-Wmissing-prototypes]
 62 | struct evergreen_power_info *evergreen_get_pi(struct radeon_device *rdev)
 | ^~~~~~~~~~~~~~~~

Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/btc_dpm.c

@@ -29,6 +29,7 @@
 #include "btc_dpm.h"
 #include "btcd.h"
 #include "cypress_dpm.h"
+#include "evergreen.h"
 #include "r600_dpm.h"
 #include "rv770.h"
 #include "radeon.h"
@@ -49,8 +50,6 @@
 #ifndef BTC_MGCG_SEQUENCE
 #define BTC_MGCG_SEQUENCE  300
 
-struct evergreen_power_info *evergreen_get_pi(struct radeon_device *rdev);
-
 extern int ni_mc_load_microcode(struct radeon_device *rdev);
 
 //********* BARTS **************//

drivers/gpu/drm/radeon/cypress_dpm.c

@@ -26,6 +26,7 @@
 
 #include "atom.h"
 #include "cypress_dpm.h"
+#include "evergreen.h"
 #include "evergreend.h"
 #include "r600_dpm.h"
 #include "rv770.h"
@@ -44,8 +45,6 @@
 #define MC_CG_SEQ_YCLK_SUSPEND      0x04
 #define MC_CG_SEQ_YCLK_RESUME       0x0a
 
-struct evergreen_power_info *evergreen_get_pi(struct radeon_device *rdev);
-
 static void cypress_enable_bif_dynamic_pcie_gen2(struct radeon_device *rdev,
 						 bool enable)
 {

drivers/gpu/drm/radeon/evergreen.h

@@ -27,6 +27,7 @@
 #define __RADEON_EVERGREEN_H__
 
 struct evergreen_mc_save;
+struct evergreen_power_info;
 struct radeon_device;
 
 bool evergreen_is_display_hung(struct radeon_device *rdev);
@@ -47,5 +48,6 @@ u32 evergreen_get_number_of_dram_channels(struct radeon_device *rdev);
 void evergreen_print_gpu_status_regs(struct radeon_device *rdev);
 u32 evergreen_gpu_check_soft_reset(struct radeon_device *rdev);
 int evergreen_rlc_resume(struct radeon_device *rdev);
+struct evergreen_power_info *evergreen_get_pi(struct radeon_device *rdev);
 
 #endif				/* __RADEON_EVERGREEN_H__ */

drivers/gpu/drm/radeon/ni_dpm.c

@@ -26,6 +26,7 @@
 #include <linux/seq_file.h>
 
 #include "atom.h"
+#include "evergreen.h"
 #include "ni_dpm.h"
 #include "nid.h"
 #include "r600_dpm.h"
@@ -720,8 +721,6 @@ static const u32 cayman_sysls_enable[] =
 };
 #define CAYMAN_SYSLS_ENABLE_LENGTH sizeof(cayman_sysls_enable) / (3 * sizeof(u32))
 
-struct evergreen_power_info *evergreen_get_pi(struct radeon_device *rdev);
-
 extern int ni_mc_load_microcode(struct radeon_device *rdev);
 
 struct ni_power_info *ni_get_pi(struct radeon_device *rdev)

drivers/gpu/drm/radeon/rv770_dpm.c

@@ -30,6 +30,7 @@
 #include "rv770_dpm.h"
 #include "cypress_dpm.h"
 #include "atom.h"
+#include "evergreen.h"
 #include <linux/seq_file.h>
 
 #define MC_CG_ARB_FREQ_F0           0x0a

drivers/gpu/drm/radeon/si_dpm.c

@@ -26,6 +26,7 @@
 #include <linux/seq_file.h>
 
 #include "atom.h"
+#include "evergreen.h"
 #include "r600_dpm.h"
 #include "rv770.h"
 #include "radeon.h"
@@ -1720,8 +1721,6 @@ static const struct si_powertune_data powertune_data_hainan =
 	true
 };
 
-struct evergreen_power_info *evergreen_get_pi(struct radeon_device *rdev);
-
 extern void vce_v1_0_enable_mgcg(struct radeon_device *rdev, bool enable);
 
 static int si_populate_voltage_value(struct radeon_device *rdev,