feat(zynqmp): increase the max xlat tables when debug build is enabled

Update the MAX_XLAT_TABLES as the memory map has been
added for the dtb to accomodate in DDR address.

Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@xilinx.com>
Change-Id: I46225673f40f123cdab38efefb038604da119b58