linux-gbmc: Fix flash layouts for 128MB SPI This change is just a build time tweak to support 128MB SPI flashes on NPCM7xx using the flash 64 layout with dynamic partitioning. Tested: Still builds fine for 64MB images but now builds 128MB images Google-Bug-Id: 374370400 Change-Id: If525f7d7f507f4cf4f9d5eb0bb80ca76776770e3 Signed-off-by: William A. Kennington III <wak@google.com>