fix(plat/xilinx/versal): resolve misra R10.3 in pm services

MISRA Violation: MISRA-C:2012 R.10.3
- The value of an expression shall not be assigned to an object with a
  narrower essential type or of a different essential type category

Signed-off-by: Abhyuday Godhasara <abhyuday.godhasara@xilinx.com>
Change-Id: I73c056ff4df2f14e04c92a49ac5c97e578e82107
5 files changed