drm/amd/powerplay: remove set but not used variable 'vbios_version', 'data'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c: In function smu7_check_mc_firmware:
drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c:4215:11: warning: variable vbios_version set but not used [-Wunused-but-set-variable]
drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c: In function smu7_get_performance_level:
drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c:5054:21: warning: variable data set but not used [-Wunused-but-set-variable]

'vbios_version' is introduced by commit 599a7e9f ("drm/amd/powerplay:
implement smu7 hwmgr to manager asics with smu ip version 7."),
but never used, so remove it.

'data' is introduced by commit f688b614 ("drm/amd/pp:
Implement get_performance_level for legacy dgpu"), but never used,
so remove it.
Reviewed-by: Evan Quan <evan.quan@amd.com>
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: zhengbin <zhengbin13@huawei.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c

@@ -4225,7 +4225,6 @@ static int smu7_check_mc_firmware(struct pp_hwmgr *hwmgr)
 {
 	struct smu7_hwmgr *data = (struct smu7_hwmgr *)(hwmgr->backend);
 
-	uint32_t vbios_version;
 	uint32_t tmp;
 
 	/* Read MC indirect register offset 0x9F bits [3:0] to see
@@ -4234,7 +4233,6 @@ static int smu7_check_mc_firmware(struct pp_hwmgr *hwmgr)
 	 */
 
 	smu7_get_mc_microcode_version(hwmgr);
-	vbios_version = hwmgr->microcode_version_info.MC & 0xf;
 
 	data->need_long_memory_training = false;
 
@@ -5064,13 +5062,11 @@ static int smu7_get_performance_level(struct pp_hwmgr *hwmgr, const struct pp_hw
 				PHM_PerformanceLevel *level)
 {
 	const struct smu7_power_state *ps;
-	struct smu7_hwmgr *data;
 	uint32_t i;
 
 	if (level == NULL || hwmgr == NULL || state == NULL)
 		return -EINVAL;
 
-	data = hwmgr->backend;
 	ps = cast_const_phw_smu7_power_state(state);
 
 	i = index > ps->performance_level_count - 1 ?