drm/amd/pm/powerplay/hwmgr/vega20_hwmgr: Provide function name 'vega20_init_smc_table()'

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

 drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/vega20_hwmgr.c:781: warning: expecting prototype for Initializes the SMC table and uploads it(). Prototype was for vega20_init_smc_table() instead

Cc: Evan Quan <evan.quan@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/pm/powerplay/hwmgr/vega20_hwmgr.c

@@ -772,7 +772,7 @@ static int vega20_setup_default_dpm_tables(struct pp_hwmgr *hwmgr)
 }
 
 /**
- * Initializes the SMC table and uploads it
+ * vega20_init_smc_table - Initializes the SMC table and uploads it
  *
  * @hwmgr:  the address of the powerplay hardware manager.
  * return:  always 0