mb/google/geralt: Add eMMC and SD card configurations

Geralt reference design has both eMMC and SD card interfaces, so we
configure both in mainboard_init() in ramstage.

TEST=boot to kernel using emmc successfully.
BUG=b:236331724

Signed-off-by: Andy-ld Lu <andy-ld.lu@mediatek.corp-partner.google.com>
Change-Id: I200a065ab96584d824153480e594e19baae97f9c
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65976
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/geralt/Kconfig

@@ -17,6 +17,8 @@ config BOARD_SPECIFIC_OPTIONS
 	select COMMON_CBFS_SPI_WRAPPER
 	select SPI_FLASH
 	select SPI_FLASH_INCLUDE_ALL_DRIVERS
+	select COMMONLIB_STORAGE
+	select COMMONLIB_STORAGE_MMC
 
 config MAINBOARD_DIR
 	string

src/mainboard/google/geralt/mainboard.c

@@ -1,10 +1,13 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <device/device.h>
+#include <soc/msdc.h>
 #include <soc/usb.h>
 
 static void mainboard_init(struct device *dev)
 {
+	mtk_msdc_configure_emmc(true);
+	mtk_msdc_configure_sdcard();
 	setup_usb_host();
 }