Maximize available SDRAM for OK6410

About 60MB of RAM is reserved for various multimedia features:

~# dmesg | grep -i ram

s3c64xx: 15728640 bytes SDRAM reserved for fimc at 0x50663000
s3c64xx: 8388608 bytes SDRAM reserved for pp at 0x51563000
s3c64xx: 8388608 bytes SDRAM reserved for tv at 0x51d63000
s3c64xx: 6291456 bytes SDRAM reserved for mfc at 0x52563000
s3c64xx: 8388608 bytes SDRAM reserved for jpeg at 0x52b63000
s3c64xx: 8388608 bytes SDRAM reserved for cmm at 0x53363000

To disable these reservation, disabled all unused drivers at:

Device Drivers->Multimedia device->Video catpure adaptors->Samsung Multimedia device