Lower GPU Overclock to 275

Change-Id: Icfca2ca10677a8e5318636c42a3fe8eb080e8d82
defconfig

Change-Id: I39733b2d4abca8c5fa44b4303cf70015d60ee9c0
fix build

Change-Id: I718a62af2957bf4c96269d07116a9620969998ed