MLECO-2426: Support for new Corstone-300 app note AN552 rev B.

These changes will limit the use of FPGA internal SRAM from a max
of 4MiB to 2MiB and the BRAM from 2MiB to 1MiB.

Change-Id: I69c8e695aee26ff4f235bfe83ffd26efbd66f547