em100: Increase maximum ROM size to 64MB

The previous maximum ROM size was 16MB. This is necessary to use em100
for emulating flash parts larger than 16MB, but I do not make any
promise that all flash parts larger than 16MB will work.

Change-Id: I94385eb9a46853e50550aa43aaa4822f24a0b095
Signed-off-by: Ryan O'Leary <ryanoleary@google.com>
Reviewed-on: https://review.coreboot.org/28945
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
1 file changed