board: toradex: verdin-imx8mm: enable usb sdp spl recovery support

Enable USB SDP SPL aka serial downloader recovery mode support.

While at it also enable fastboot support which may be used to
subsequently load further stages like a Toradex Easy Installer FIT
image.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Fabio Estevam <festevam@denx.de>
2 files changed