mediatek/mt8183: Add mtcmos init support

Using common mtcmos code to power on audio and display modules in SOC.

BUG=b:80501386
BRANCH=none
TEST=Boots correctly on Kukui. Passes the status check at the end of
     mtcmos_power_on()

Change-Id: I41f16ba36432a8bbc47793cec2979753c9f84b43
Signed-off-by: Tristan Shieh <tristan.shieh@mediatek.com>
Reviewed-on: https://review.coreboot.org/27030
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

src/soc/mediatek/common/include/soc/mtcmos.h

@@ -19,4 +19,6 @@
 void mtcmos_audio_power_on(void);
 void mtcmos_display_power_on(void);
 
+void mtcmos_protect_display_bus(void);
+
 #endif /* __SOC_MEDIATEK_COMMON_MTCMOS_H__ */