Implement below clock related APIs:
  - Clock enable
  - Clock disable
  - Clock get status
  - Clock set divider
  - Clock get divider
  - Clock set parent
  - Clock get parent

Signed-off-by: Tejas Patel <tejas.patel@xilinx.com>
Signed-off-by: Jolly Shah <jolly.shah@xilinx.com>
Change-Id: Ibb3606e88ac6796d9d759226908b2c2997c5fea0