[coreboot] [PATCH] CONFIG_LB_MEM_TOPK -> CONFIG_RAMTOP

[Myles Watson]

LB_MEM_TOPK is making it hard for me to modify linker scripts because
sometimes the shifting breaks it.

RAMTOP is much nicer:
- No need to shift it
- Matches with RAMBASE
- Shows up in the correct place in coreboot_ram.map

topk_defaults.diff & topk_shifts.diff are almost trivial, and were done 99%
by scripts.
topk_fixups.diff was done by hand and verified with meld, so I'm pretty sure
but I'd like another pair of eyes.

There was only one place where I had to do (RAMBASE >> 10)!

Abuild tested.

Signed-off-by: Myles Watson <mylesgw at gmail.com>

Thanks,
Myles
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