soc/mediatek/common/mcu.c: Use 'enum cb_err' instead of 'int'

mtk_init_mcu() function already returns enum cb_err.

Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Change-Id: I562bfbdc5c917a17ce1aa656046b69eb56dce48c
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68241
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>

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

@@ -13,6 +13,6 @@ struct mtk_mcu {
 	void (*reset)(struct mtk_mcu *mcu);	/* The reset callback */
 };
 
-int mtk_init_mcu(struct mtk_mcu *mcu);
+enum cb_err mtk_init_mcu(struct mtk_mcu *mcu);
 
 #endif /* SOC_MEDIATEK_MTLIB_COMMON_H */

src/soc/mediatek/common/mcu.c

@@ -7,7 +7,7 @@
 #include <soc/symbols.h>
 #include <timer.h>
 
-int mtk_init_mcu(struct mtk_mcu *mcu)
+enum cb_err mtk_init_mcu(struct mtk_mcu *mcu)
 {
 	struct stopwatch sw;