drm/radeon: add missing header dependencies

We get a few warnings when building kernel with W=1:
drivers/gpu/drm/radeon/radeon_clocks.c:35:10: warning: no previous prototype for 'radeon_legacy_get_engine_clock' [-Wmissing-prototypes]
drivers/gpu/drm/radeon/atombios_encoders.c:75:1: warning: no previous prototype for 'atombios_get_backlight_level' [-Wmissing-prototypes]
drivers/gpu/drm/radeon/r600_cs.c:2268:5: warning: no previous prototype for 'r600_cs_parse' [-Wmissing-prototypes]
drivers/gpu/drm/radeon/evergreen_cs.c:2671:5: warning: no previous prototype for 'evergreen_cs_parse' [-Wmissing-prototypes]
....

In fact, these functions are declared
in drivers/gpu/drm/radeon/radeon_asic.h,
so this patch adds missing header dependencies.
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Baoyou Xie <baoyou.xie@linaro.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/atombios_encoders.c

@@ -28,6 +28,7 @@
 #include <drm/radeon_drm.h>
 #include "radeon.h"
 #include "radeon_audio.h"
+#include "radeon_asic.h"
 #include "atom.h"
 #include <linux/backlight.h>
 

drivers/gpu/drm/radeon/evergreen_cs.c

@@ -27,6 +27,7 @@
  */
 #include <drm/drmP.h>
 #include "radeon.h"
+#include "radeon_asic.h"
 #include "evergreend.h"
 #include "evergreen_reg_safe.h"
 #include "cayman_reg_safe.h"

drivers/gpu/drm/radeon/r600_cs.c

@@ -28,6 +28,7 @@
 #include <linux/kernel.h>
 #include <drm/drmP.h>
 #include "radeon.h"
+#include "radeon_asic.h"
 #include "r600d.h"
 #include "r600_reg_safe.h"
 

drivers/gpu/drm/radeon/radeon_atombios.c

@@ -29,6 +29,7 @@
 
 #include "atom.h"
 #include "atom-bits.h"
+#include "radeon_asic.h"
 
 extern void
 radeon_add_atom_encoder(struct drm_device *dev, uint32_t encoder_enum,

drivers/gpu/drm/radeon/radeon_clocks.c

@@ -29,6 +29,7 @@
 #include <drm/radeon_drm.h>
 #include "radeon_reg.h"
 #include "radeon.h"
+#include "radeon_asic.h"
 #include "atom.h"
 
 /* 10 khz */

drivers/gpu/drm/radeon/radeon_legacy_encoders.c

@@ -27,6 +27,7 @@
 #include <drm/drm_crtc_helper.h>
 #include <drm/radeon_drm.h>
 #include "radeon.h"
+#include "radeon_asic.h"
 #include "atom.h"
 #include <linux/backlight.h>
 #ifdef CONFIG_PMAC_BACKLIGHT