drm/amd/display/dc/core/dc_link_ddc: Move DP_DVI_CONVERTER_ID_{4, 5} to where they're used

This patch fixes >200 warnings.

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

 from drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:31:
 drivers/gpu/drm/amd/amdgpu/../display/include/ddc_service_types.h:126:22: warning: ‘DP_DVI_CONVERTER_ID_5’ defined but not used [-Wunused-const-variable=]
 126 | static const uint8_t DP_DVI_CONVERTER_ID_5[] = "3393N2";
 | ^~~~~~~~~~~~~~~~~~~~~
 drivers/gpu/drm/amd/amdgpu/../display/include/ddc_service_types.h:125:22: warning: ‘DP_DVI_CONVERTER_ID_4’ defined but not used [-Wunused-const-variable=]
 125 | static const uint8_t DP_DVI_CONVERTER_ID_4[] = "m2DVIa";
 | ^~~~~~~~~~~~~~~~~~~~~

Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Leo Li <sunpeng.li@amd.com>
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/amd/display/dc/core/dc_link_ddc.c

@@ -37,6 +37,10 @@
 #include "dc_link_ddc.h"
 #include "dce/dce_aux.h"
 
+/*DP to Dual link DVI converter*/
+static const uint8_t DP_DVI_CONVERTER_ID_4[] = "m2DVIa";
+static const uint8_t DP_DVI_CONVERTER_ID_5[] = "3393N2";
+
 #define AUX_POWER_UP_WA_DELAY 500
 #define I2C_OVER_AUX_DEFER_WA_DELAY 70
 #define I2C_OVER_AUX_DEFER_WA_DELAY_1MS 1

drivers/gpu/drm/amd/display/include/ddc_service_types.h

@@ -117,8 +117,4 @@ struct av_sync_data {
 	uint8_t aud_del_ins3;/* DPCD 0002Dh */
 };
 
-/*DP to Dual link DVI converter*/
-static const uint8_t DP_DVI_CONVERTER_ID_4[] = "m2DVIa";
-static const uint8_t DP_DVI_CONVERTER_ID_5[] = "3393N2";
-
 #endif /* __DAL_DDC_SERVICE_TYPES_H__ */