Revert "GPU Overclocking: add 450 MHz option"

This reverts commit f8d9b6406478b6cfd0ef46b6f50aaa8b3cf8b507.
Revert "GPU Overclock: GPU overclocking to 487.5 MHz"

This reverts commit ca1bdf428ed94084c6352909080ab480dd9a17e3.

Conflicts:

	arch/arm/mach-msm/Kconfig
defconfig update