Revision 3148

Following patch extends the ROM decoding to last 1MB, allowing to use larger
flashes such as SST49LF080A: 1024K x8 (8 Mbit)

Tested on my system, the flash is found and if I use coreboot in second half it
works too.

Signed-off-by: Rudolf Marek <r.marek@assembler.cz>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>