drm/amd/display: Provide function name for 'optc32_enable_crtc()'

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

drivers/gpu/drm/amd/amdgpu/../display/dc/dcn32/dcn32_optc.c:109: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
 * Enable CRTC

Cc: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Cc: Aurabindo Pillai <aurabindo.pillai@amd.com>
Cc: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn32/dcn32_optc.c

@@ -106,8 +106,11 @@ void optc32_set_h_timing_div_manual_mode(struct timing_generator *optc, bool man
 			OTG_H_TIMING_DIV_MODE_MANUAL, manual_mode ? 1 : 0);
 }
 /**
- * Enable CRTC
- * Enable CRTC - call ASIC Control Object to enable Timing generator.
+ * optc32_enable_crtc() - Enable CRTC - call ASIC Control Object to enable Timing generator.
+ *
+ * @optc: timing_generator instance.
+ *
+ * Return: If CRTC is enabled, return true.
  */
 static bool optc32_enable_crtc(struct timing_generator *optc)
 {