[coreboot] [patch] i82810 WIP for fixing VGA and 512MB

[Elia Yehuda]

Those 2 patches are one step towards having a working Onboard-VGA
and 512MB (the max for i810). The raminit.c patch fixes some
misconfigurations and probes the DIMMs correctly (all dual-sided are
now recognized properly), and also set buffer_strength to handle 2
DIMMs although atm this doesn't work. The i82810/northbridge.c patch
takes care of allocating Onboard-VGA memory.

Signed-off-by: Elia Yehuda