ARM: multi_v7_defconfig: Enable CONFIG_MMC_MESON_MX_SDHC

Enable CONFIG_MMC_MESON_MX_SDHC so that SDHC host controller
on Amlogic SoCs boards enable support for eMMC and MMC drivers.

Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: NMartin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: NAnand Moon <linux.amoon@gmail.com>
Signed-off-by: NNeil Armstrong <narmstrong@baylibre.com>
Link: https://lore.kernel.org/r/20210715092233.1084-1-linux.amoon@gmail.com

arch/arm/configs/multi_v7_defconfig

@@ -870,6 +870,7 @@ CONFIG_MMC_SDHCI_PXAV2=m
 CONFIG_MMC_SDHCI_SPEAR=y
 CONFIG_MMC_SDHCI_S3C_DMA=y
 CONFIG_MMC_SDHCI_BCM_KONA=y
+CONFIG_MMC_MESON_MX_SDHC=y
 CONFIG_MMC_MESON_MX_SDIO=y
 CONFIG_MMC_SDHCI_ST=y
 CONFIG_MMC_OMAP=y