ZynqMP pm_service ipi file uses platform specific macros names.
pm_service ipi functions can be used by other Xilinx platforms
also. Make rename macros to use generic names so that it can be
used by common file.

pm_service ipi functions will be moved to common file in next patch.

Signed-off-by: Tejas Patel <tejas.patel@xilinx.com>
Reviewed-by: Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com>
Signed-off-by: Jolly Shah <jollys@xilinx.com>