mb/google/rauru: Add SD card configurations

Rauru reference design has SD card interfaces, so we configure it in
mainboard_init() in ramstage.

BUG=b:317009620
TEST=Build pass. Check storage in depthcharge.
firmware-shell: storage init
*  0: UFS LUN 0
   1: removable mtk_mmc

Change-Id: Ia9f12df85c5f9f9d134990edcf82bf0df9ea995d
Signed-off-by: Andy-ld Lu <andy-ld.lu@mediatek.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/85565
Reviewed-by: Yidi Lin <yidilin@google.com>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/rauru/Kconfig

@@ -30,6 +30,8 @@ config BOARD_SPECIFIC_OPTIONS
 	select I2C_TPM if VBOOT
 	select MAINBOARD_HAS_TPM2 if VBOOT
 	select TPM_GOOGLE_TI50 if VBOOT
+	select COMMONLIB_STORAGE
+	select COMMONLIB_STORAGE_MMC
 
 config MAINBOARD_DIR
 	string

src/mainboard/google/rauru/mainboard.c

@@ -9,6 +9,7 @@
 #include <soc/dpm_v2.h>
 #include <soc/gpio_common.h>
 #include <soc/i2c.h>
+#include <soc/msdc.h>
 #include <soc/pcie.h>
 #include <soc/usb.h>
 
@@ -55,6 +56,9 @@ static void mainboard_init(struct device *dev)
 	power_on_fpmcu();
 	configure_audio();
 
+	if (CONFIG(RAURU_SDCARD_INIT))
+		mtk_msdc_configure_sdcard();
+
 	if (dpm_init())
 		printk(BIOS_ERR, "dpm init failed, DVFS may not work\n");