mach-k3: add carveouts for TFA and optee

mach-k3: add carveouts for TFA and optee

K3 platforms have reserved memory regions for TFA and OPTEE which should
be unmapped for U-Boot. While other "no-map" memory regions like the
memory pools for remote cores should not be unmapped to allow U-Boot to
load firmware during remoteproc.

Therefore this patch adds the necessary fdt fixups to properly set the
load address for TFA/OPTEE and unmaps both by mmu_unmap_reserved_mem.

Reviewed-by: Dhruva Gole <d-gole@ti.com>
Signed-off-by: Anshul Dalal <anshuld@ti.com>
Tested-by: Wadim Egorov <w.egorov@phytec.de>