Implement below pin control related APIs:
  - Request pin
  - Release pin
  - Set pin function
  - Get pin function
  - Set pin parameter value
  - Get pin parameter value
Signed-off-by: Tejas Patel <tejas.patel@xilinx.com>
Signed-off-by: Jolly Shah <jolly.shah@xilinx.com>
Change-Id: Ib805cc8c936b63206d44bf1f7bebd0f03f7b3c01