[coreboot] [PATCH] use coreboot.rom for CBFS images, but default to smaller size

[Patrick Georgi]

Hi,

attached patch changes the bootblock generation for CBFS images.
It uses coreboot.rom (padded and all), but defaults to smaller fallback/normal 
image sizes.
It requires changes to each CBFS aware mainboard config (and requires adaption 
on conversion), but it fixes using normal image (as the offsets are calculated 
correctly).

I tried to get rid of ROM_IMAGE_SIZE and friends, but that'll have to wait 
until non-CBFS images are gone - maintaining two separate build configurations 
in a single build system isn't fun.

If this gets accepted, I'll propose a patch for the (few) CBFS boards, and 
commit them together.

Signed-off-by: Patrick Georgi

Patrick