arm: K3: am654: Add support for getting boot mode
Read the boot mode register to find the boot mode. Only use eMMC boot0 mode when the mode is eMMC boot (called BOOT_DEVICE_MMC1 currently due to current conflating of boot mode and boot device), and not iff the boot device is MMC port 0. Signed-off-by: NAndrew F. Davis <afd@ti.com> Reviewed-by: NTom Rini <trini@konsulko.com> Reviewed-by: NLokesh Vutla <lokeshvutla@ti.com>
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