feat(versal-net): add build config for disabling platform management

Added build configuration for Xilinx Versal NET SoC with platform
management support disabled, to cover "plat_psci.c" file to be analysed
by TF-A CI coverity job.

Signed-off-by: Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com>
Change-Id: I3cb61757b6fb5fc9bb9f98ec81694249f099920f
1 file changed