mach-k3: map all banks using mem_map_from_dram_banks

mach-k3: map all banks using mem_map_from_dram_banks

The static memory map for K3 (k3_mem_map) only maps the first DRAM bank
and therefore doesn't scale for platforms with multiple memory banks.

This patch modifies enable_caches to add mem_map_from_dram_banks which
appends all the memory banks to k3_mem_map before calling mmu_setup.

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