Patch merged into coreboot/master: Kconfig: lay groundwork for not assuming SPI flash boot device

the following patch was just integrated into master:
commit 4a36c4e9fc66bf442f46e1e6d742b2d6c50a2ae1
Author: Aaron Durbin 
Date:   Thu Aug 11 11:02:26 2016 -0500

Kconfig: lay groundwork for not assuming SPI flash boot device

Almost all boards and chipsets within the codebase assume or
    use SPI flash as the boot device. Therefore, provide an option
    for the boards/chipsets which don't currently support SPI flash
    as the boot device. The default is to assume SPI flash is the
    boot device unless otherwise instructed. This falls in line
    with the current assumptions, but it also allows one to
    differentiate a platform desiring SPI flash support while it not
    being the actual boot device.

One thing to note is that while google/daisy does boot with SPI
    flash part no SPI API interfaces were ever implemented. Therefore,
    mark that board as not having a SPI boot device.

BUG=chrome-os-partner:56151

Change-Id: Id4e0b4ec5e440e41421fbb6d0ca2be4185b62a6e
    Signed-off-by: Aaron Durbin 
    Reviewed-on: https://review.coreboot.org/16191
    Tested-by: build bot (Jenkins)
    Reviewed-by: Furquan Shaikh

See https://review.coreboot.org/16191 for details.

-gerrit