[coreboot] amd/rs690/gfx.c cleanup

[Josef Kellermann]

removed /* LPC DMA Deadlock workaround? */ ...

setting bit#21 in k8_f0#68 is part of the errata#169 which is handled in 
amdk8/coherent.c

see patch for details.

Signed-off-by: Josef Kellermann <seppk at arcor.de> <mailto://seppk@arcor.de>

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