ich_descriptors: Use MAX_NUM_FLREGS for entries[]

5 regions made sense in 2013 when this bit of code was originally
written. MAX_NUM_FLREGS is now used to keep track of the max number of
flash regions and is >5 since Sunrise Point.

Change-Id: Idb559e618369fecf930724a7c1c84765247f3e38
Signed-off-by: David Hendricks <dhendricks@fb.com>
Reviewed-on: https://review.coreboot.org/21338
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
1 file changed