arm: m53evk: Enable FS_GENERIC

Enable the CONFIG_CMD_FS_GENERIC on m53evk to avoid per-fs specific commands
and tweak the environment to cater for this new option.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
1 file changed