configs: am62ax_evm_a53_defconfig: Enable YMODEM support at A53 SPL

This is required for UART boot flow where u-boot.img needs to be
downloaded via YMODEM.

Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Reviewed-by: Bryan Brattlof <bb@ti.com>
1 file changed