drm/amd/display: dumb_abm_lcd: avoid missing-prototype warnings

The dmub_abm_set_ambient_level() function has no caller and can
just be removed, the other ones have a declaration in the
header file and just need to see the prototype:

drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:122:14: error: no previous prototype for function 'dmub_abm_get_current_backlight' [-Werror,-Wmissing-prototypes]
drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:133:14: error: no previous prototype for function 'dmub_abm_get_target_backlight' [-Werror,-Wmissing-prototypes]
drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:144:6: error: no previous prototype for function 'dmub_abm_set_level' [-Werror,-Wmissing-prototypes]
drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:163:6: error: no previous prototype for function 'dmub_abm_set_ambient_level' [-Werror,-Wmissing-prototypes]
drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:183:6: error: no previous prototype for function 'dmub_abm_init_config' [-Werror,-Wmissing-prototypes]
drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:213:6: error: no previous prototype for function 'dmub_abm_set_pause' [-Werror,-Wmissing-prototypes]
drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:231:6: error: no previous prototype for function 'dmub_abm_set_pipe' [-Werror,-Wmissing-prototypes]
drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dmub_abm_lcd.c:251:6: error: no previous prototype for function 'dmub_abm_set_backlight_level' [-Werror,-Wmissing-prototypes]

Fixes: b8fe56375f78 ("drm/amd/display: Refactor ABM feature")
Signed-off-by: Arnd Bergmann <[e-mail]>
Signed-off-by: Hamza Mahfooz <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/dc/dce/dmub_abm_lcd.c

···
  */
 
 #include "dmub_abm.h"
+#include "dmub_abm_lcd.h"
 #include "dce_abm.h"
 #include "dc.h"
 #include "dc_dmub_srv.h"
···
 
 	return true;
 }
-
-#ifndef TRIM_AMBIENT_GAMMA
-void dmub_abm_set_ambient_level(struct abm *abm, unsigned int ambient_lux, uint8_t panel_mask)
-{
-	union dmub_rb_cmd cmd;
-	struct dc_context *dc = abm->ctx;
-
-	if (ambient_lux > 0xFFFF)
-		ambient_lux = 0xFFFF;
-
-	memset(&cmd, 0, sizeof(cmd));
-	cmd.abm_set_ambient_level.header.type = DMUB_CMD__ABM;
-	cmd.abm_set_ambient_level.header.sub_type = DMUB_CMD__ABM_SET_AMBIENT_LEVEL;
-	cmd.abm_set_ambient_level.abm_set_ambient_level_data.ambient_lux = ambient_lux;
-	cmd.abm_set_ambient_level.abm_set_ambient_level_data.version = DMUB_CMD_ABM_CONTROL_VERSION_1;
-	cmd.abm_set_ambient_level.abm_set_ambient_level_data.panel_mask = panel_mask;
-	cmd.abm_set_ambient_level.header.payload_bytes = sizeof(struct dmub_cmd_abm_set_ambient_level_data);
-
-	dm_execute_dmub_cmd(dc, &cmd, DM_DMUB_WAIT_TYPE_WAIT);
-}
-#endif
 
 void dmub_abm_init_config(struct abm *abm,
 	const char *src,