plat:xilinx:versal: Use defaults when PDI is without sw partitions

In JTAG mode check the ATF handoff structure, if the magic string
is not present then use bl32 and bl33 default values.

Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@xilinx.com>
Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com>
Change-Id: I1f2c4a2060d8a2e70d3b5fb2473124b685f257fc
1 file changed