Boot the librem5 devkit

This is a bootable dot config and deviretree for the Librem5 devkit

arch/arm64/configs/librem5-devkit_defconfig

@@ -2910,7 +2910,18 @@ CONFIG_MMC_BLOCK_MINORS=32
 # CONFIG_MMC_DEBUG is not set
 CONFIG_MMC_ARMMMCI=y
 CONFIG_MMC_STM32_SDMMC=y
-# CONFIG_MMC_SDHCI is not set
+CONFIG_MMC_SDHCI=y
+CONFIG_MMC_SDHCI_IO_ACCESSORS=y
+# CONFIG_MMC_SDHCI_PCI is not set
+# CONFIG_MMC_SDHCI_ACPI is not set
+CONFIG_MMC_SDHCI_PLTFM=y
+# CONFIG_MMC_SDHCI_OF_ARASAN is not set
+# CONFIG_MMC_SDHCI_OF_AT91 is not set
+# CONFIG_MMC_SDHCI_OF_ESDHC is not set
+# CONFIG_MMC_SDHCI_OF_DWCMSHC is not set
+# CONFIG_MMC_SDHCI_CADENCE is not set
+CONFIG_MMC_SDHCI_ESDHC_IMX=y
+# CONFIG_MMC_SDHCI_F_SDH30 is not set
 # CONFIG_MMC_MXC is not set
 # CONFIG_MMC_TIFM_SD is not set
 CONFIG_MMC_SPI=y
@@ -2921,6 +2932,9 @@ CONFIG_MMC_SPI=y
 CONFIG_MMC_CQHCI=y
 # CONFIG_MMC_TOSHIBA_PCI is not set
 # CONFIG_MMC_MTK is not set
+# CONFIG_MMC_SDHCI_XENON is not set
+# CONFIG_MMC_SDHCI_OMAP is not set
+# CONFIG_MMC_SDHCI_AM654 is not set
 # CONFIG_MEMSTICK is not set
 CONFIG_NEW_LEDS=y
 CONFIG_LEDS_CLASS=y