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cleans up and corrects some registers in gm45 native graphic init.
Results is that previously incompatible wxga+ screens now have a strip
of working display.

Adapted from https://review.coreboot.org/cgit/coreboot.git/commit/util/cbfstool/Makefile.inc?id=2b80734811ee056f0447bab359ec5961e90101b7

overlapping cmos parametes were result of uncarefull reverting.

The gm45 integrated gpu scales very well with more vram,
both for video decoding and games.
Setting it to the highest stable value is a good default for libreboot.

Also removes hardcoded use of igd since code is different.
Can be added in later patch but since libreboot always
loads cmos defaults this might not be necessary.

Documentation did not build because node
"How to program an SPI flash chip with BeagleBone Black"
did not exist. Switching @node and @subsection title fixes this

This reverts commit e4e705e9.