dra7xx_evm: Enabled UART-boot mode and add dra7xx_evm_uart3 build
UART booting is supported on this SoC, but via UART3 rather than UART1. Because of this we must change the board to use UART3 for all console access (only one UART is exposed on this board and a slight HW mod is required to switch UARTs). Signed-off-by: NMinal Shah <minal.shah@ti.com> [trini: Make apply to mainline, reword commit] Signed-off-by: NTom Rini <trini@ti.com>
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