When trying to flash a single FMAP region on VBOOT enabled boards the
default of 32 entries is to small to store all regions. Flashrom will
bail out with "Cannot add fmap entries to layout - Too many entries."

Increase the maximum rom layout size to 128 to support complex FMAPs.

Tested on coreboot's UP/squared mainboard using SF600.
With this patch it's possible to update a single FMAP region.

Change-Id: I68084b08f7b35a162b5f2d3109d82a8b63c194ff
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/34025


Tested-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Christian Walter <christian.walter@9elements.com>