Add 512Mhz GPU slot and lower voltages of 384Mhz and 512Mhz GPU slots

Signed-off-by: Dan Trifan <jimsth@gmail.com>

Conflicts:
	arch/arm/mach-omap2/opp4xxx_data.c

Conflicts:
	arch/arm/mach-omap2/opp4xxx_data.c
Revert "Add 512Mhz GPU slot and lower voltages of 384Mhz and 512Mhz GPU slots"

This reverts commit 2d47f3b01ba1cb0c88213e63035e103a225bbb16.

Conflicts:
	arch/arm/mach-omap2/opp4xxx_data.c