build(versal): update config for ddr

A build time parameter XILINX_OF_BOARD_DTB_ADDR is introduced
for Versal platform which provides the DTB address.
When the TF_A is placed and executed from DDR and DTB load address
is provided in above param, TF-A will update the DTB, at runtime,
adding a reserved memory node for its address range in ddr.

Signed-off-by: Akshay Belsare <akshay.belsare@amd.com>
Change-Id: I7d79cd37efeb4a3382cafd302461b876f1732277
1 file changed