arm64: defconfig: Increase MMC_BLOCK_MINORS to 16

Increase the block minors from the default 8 to 16. The db410c board
by default has eMMC rootfs on the 10th partition.
Signed-off-by: NGeorgi Djakov <georgi.djakov@linaro.org>
Signed-off-by: NOlof Johansson <olof@lixom.net>

arch/arm64/configs/defconfig

@@ -205,6 +205,7 @@ CONFIG_USB_MSM_OTG=y
 CONFIG_USB_ULPI=y
 CONFIG_USB_GADGET=y
 CONFIG_MMC=y
+CONFIG_MMC_BLOCK_MINORS=16
 CONFIG_MMC_ARMMMCI=y
 CONFIG_MMC_SDHCI=y
 CONFIG_MMC_SDHCI_PLTFM=y