plat: xilinx: zynqmp: Get chipid from registers for BL32

This patch reads the chipid registers directly instead of making
pm call when running at BL32. User should ensure that these registers
should always be accessed from APU in their system configuration.

Signed-off-by: Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com>
1 file changed