fix(plat/xilinx/versal): resolve misra R10.6 in pm services

MISRA Violation: MISRA-C:2012 R.10.6
- The value of a composite expression shall not be assigned to an object
  with wider essential type.

Signed-off-by: Abhyuday Godhasara <abhyuday.godhasara@xilinx.com>
Change-Id: I67ac6b6b4b643f57e76a435345540e241c9a88b9
2 files changed