drm/amd/display: make optc314_phantom_crtc_post_enable static

This symbol is not used outside of dcn314_optc.c, so marks it static.

drivers/gpu/drm/amd/amdgpu/../display/dc/dcn314/dcn314_optc.c:153:6: warning: no previous prototype for ‘optc314_phantom_crtc_post_enable’.

Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=2147Reported-by: NAbaci Robot <abaci@linux.alibaba.com>
Signed-off-by: NJiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn314/dcn314_optc.c

@@ -150,7 +150,7 @@ static bool optc314_disable_crtc(struct timing_generator *optc)
 	return true;
 }
 
-void optc314_phantom_crtc_post_enable(struct timing_generator *optc)
+static void optc314_phantom_crtc_post_enable(struct timing_generator *optc)
 {
 	struct optc *optc1 = DCN10TG_FROM_TG(optc);