imx8mp_rsb3720a1: Enable cache in SPL

There is no reason for disabling I-cache and D-cache
in SPL.

Remove the unneeded CONFIG_SPL_SYS_ICACHE_OFF and
CONFIG_SPL_SYS_DCACHE_OFF options.

Signed-off-by: Fabio Estevam <festevam@denx.de>
2 files changed