[U-Boot] armv8: cache_v8: mmu setup have the wrong pte attribute

Hi all

I do some test on my board which have two armv8 CA53 core, and I found some region (1MB size) don't be correctly mapped by MMU. Through ds5 I can't find this region were mapped. I did some deep debug and found add_map function in cache_v8.c files maybe have some wrong operation for Some region which size equal to 1MB. For 1MB size region need three level translation and the descriptor of level 3 is different with level 1 and level 2. Look like current add_map function can't handle this case. Did someone hit this bug? By the way I use the 2017.05 version.

Any feedback would be appreciate.

Thanks, Jay