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 <[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/pm/powerplay/hwmgr/vega20_hwmgr.c

···
 }
 
 /**
- * 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