Added kernel level Sound Control GPL interface (thanks to @faux123)

Signed-off-by: Arnav Gosain <nolinuxnoparty@gmail.com>
added GPU O/C upto 533MHz

Signed-off-by: Arnav Gosain <nolinuxnoparty@gmail.com>
added GPU O/C freq 487.5MHz

Signed-off-by: Arnav Gosain <nolinuxnoparty@gmail.com>