soc/mediatek/mt8186: Add support for PMIC MT6366

Add basic support for VCORE/VDRAM1/VDDQ of MT6366.

TEST=build pass
BUG=b:202871018

Signed-off-by: James Lo <james.lo@mediatek.corp-partner.google.com>
Change-Id: I22e30421560a32f4a9e15899e8150376b1414494
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59245
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>

src/mainboard/google/corsola/romstage.c

@@ -1,7 +1,9 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <arch/stages.h>
+#include <soc/mt6366.h>
 
 void platform_romstage_main(void)
 {
+	mt6366_init();
 }