zynqmp : pm : Adds new zynqmp-pm api SMC call for register access

This patch adds new zynqmp-pm api to provide read/write access to
CSU or PMU global registers.

Signed-off-by: Kalyani Akula <kalyania@xilinx.com>
Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com>
Change-Id: I4fd52eb732fc3e6a8bccd96cad7dc090b2161042
5 files changed