mediatek: drop kmod-mmc

Support for MMC is built-into the kernel anyway, no need to select the
(empty/stub) kmod package.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

target/linux/mediatek/image/mt7623.mk

@@ -88,7 +88,7 @@ define Device/bananapi_bpi-r2
   DEVICE_VENDOR := Bananapi
   DEVICE_MODEL := BPi-R2
   DEVICE_DTS := mt7623n-bananapi-bpi-r2
-  DEVICE_PACKAGES := kmod-mmc mkf2fs e2fsprogs kmod-usb3 kmod-ata-ahci
+  DEVICE_PACKAGES := mkf2fs e2fsprogs kmod-usb3 kmod-ata-ahci
   UBOOT_ENVSIZE := 0x10000
   UBOOT_OFFSET := 320k
   UBOOT_TARGET := mt7623n_bpir2