drm/amd/display: make mmhubbub32_config_mcif_buf static

This symbol is not used outside of dcn32_mmhubbub.c, so marks it static.

drivers/gpu/drm/amd/amdgpu/../display/dc/dcn32/dcn32_mmhubbub.c:103:6: warning: no previous prototype for ‘mmhubbub32_config_mcif_buf’.

Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=2145Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn32/dcn32_mmhubbub.c

@@ -100,7 +100,7 @@ static void mmhubbub32_warmup_mcif(struct mcif_wb *mcif_wb,
 	REG_UPDATE(MMHUBBUB_WARMUP_CONTROL_STATUS, MMHUBBUB_WARMUP_EN, false);
 }
 
-void mmhubbub32_config_mcif_buf(struct mcif_wb *mcif_wb,
+static void mmhubbub32_config_mcif_buf(struct mcif_wb *mcif_wb,
 		struct mcif_buf_params *params,
 		unsigned int dest_height)
 {