drm/amd/display: make dcn32_link_encoder_is_in_alt_mode and...

drm/amd/display: make dcn32_link_encoder_is_in_alt_mode and dcn32_link_encoder_get_max_link_cap static

These two functions are not used outside the function
dcn32_dio_link_encoder.c, so the modification is defined as static.

drivers/gpu/drm/amd/amdgpu/../display/dc/dcn32/dcn32_dio_link_encoder.c:121:6: warning: no previous prototype for ‘dcn32_link_encoder_is_in_alt_mode’.
drivers/gpu/drm/amd/amdgpu/../display/dc/dcn32/dcn32_dio_link_encoder.c:136:6: warning: no previous prototype for ‘dcn32_link_encoder_get_max_link_cap’.

Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=2117Reported-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/dcn32/dcn32_dio_link_encoder.c

@@ -118,7 +118,7 @@ void dcn32_link_encoder_enable_dp_output(
 	}
 }
 
-bool dcn32_link_encoder_is_in_alt_mode(struct link_encoder *enc)
+static bool dcn32_link_encoder_is_in_alt_mode(struct link_encoder *enc)
 {
 	struct dcn10_link_encoder *enc10 = TO_DCN10_LINK_ENC(enc);
 	uint32_t dp_alt_mode_disable = 0;
@@ -133,7 +133,7 @@ bool dcn32_link_encoder_is_in_alt_mode(struct link_encoder *enc)
 	return is_usb_c_alt_mode;
 }
 
-void dcn32_link_encoder_get_max_link_cap(struct link_encoder *enc,
+static void dcn32_link_encoder_get_max_link_cap(struct link_encoder *enc,
 	struct dc_link_settings *link_settings)
 {
 	struct dcn10_link_encoder *enc10 = TO_DCN10_LINK_ENC(enc);