uboot-phytec

am57xx_evm_defconfig: Enable configs to support QSPI boot

AM57xx IDK EVMs can boot out of QSPI. Enable configs to support QSPI
boot. Also enable configs for updating QSPI boot images over DFU.

Tested on AM572x IDK EVM.

Signed-off-by: Vignesh R <vigneshr@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>