configs: am62x_a53: introduce fragment for USB MSC boot

Introduce the config fragment for enabling USB MSC boot. USB MSC boot
involves fetching the next stage of the bootloader from a USB Mass Storage
device such as a USB Flash Drive with the USB controller on the SoC acting
as the USB Host.

Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
1 file changed