Revert Ram OC.

Ram frequency is set from OMAPXLOADER during boot (400mhz), so changing it here is useless.
The only way to OC, at the moment, is to use the modified Core OC by Pattyboi, which sets the ram to 480mhz while the device is on.
Update .gitignore
TEST:
enable full zero write mode and add+tune scu speculative linefills,use this without double linefill
set this to 4
5 seems best
omap4-common cache offset value tuning
fix the full zero value