ARM: mach-shmobile: mackerel: enable MMCIF and SDHI in defconfig

I'm unsure why this isn't already the case.
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/configs/mackerel_defconfig

@@ -94,6 +94,9 @@ CONFIG_USB_RENESAS_USBHS=y
 CONFIG_USB_STORAGE=y
 CONFIG_USB_GADGET=y
 CONFIG_USB_RENESAS_USBHS_UDC=y
+CONFIG_MMC=y
+CONFIG_MMC_SDHI=y
+CONFIG_MMC_SH_MMCIF=y
 CONFIG_DMADEVICES=y
 CONFIG_SH_DMAE=y
 CONFIG_EXT2_FS=y