[gpu][amlogic] Add IOCTLs for changing GPU clock freq. TEST- Ran GPU tests to ensure nothing broke Change-Id: I9fb9d52bfdbeaca3e75021e2e5112bdecb6d04e0
[amlogic][gpu] Refactoring GPU driver Change-Id: Ic04890b638912982e780b1141c301adf57548fbe