uboot-imx

armv8: caches: Added routine to set non cacheable region

Added routine mmu_set_region_dcache_behaviour() to set a
particular region as non cacheable.

Define dummy routine for mmu_set_region_dcache_behaviour()
to handle incase of dcache off.

Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Acked-by: Michal Simek <michal.simek@xilinx.com>