arch: arm: omap4: bump 307MHz GPU to 384MHz without increasing the voltages and add an extra OPP with 512MHz to compensate for the weak GPU and low memory bandwidth, which is, in this device's case, its major bottleneck.

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
Signed-off-by: Francisco Franco <franciscofranco.1990@gmail.com>