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 <[e-mail]>
Cc: Leo Li <[e-mail]>
Cc: Alex Deucher <[e-mail]>
Cc: "Christian König" <[e-mail]>
Cc: David Airlie <[e-mail]>
Cc: Daniel Vetter <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Signed-off-by: Lee Jones <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c

···
 #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

···
 	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__ */