Patch merged into coreboot/master: Documentation: x86 shadow ROM disable

the following patch was just integrated into master:
commit e9a6d1a813f61b505f9463160c27992419cb9056
Author: Lee Leahy 
Date:   Sun Jan 31 11:28:06 2016 -0800

Documentation: x86 shadow ROM disable

Add documentation on disabling the SPI flash which is mapped (shadowed)
    into the x86 address space at 0x000e0000 - 0x000fffff.

TEST=None

Change-Id: I1d94d84c6cade97886a3274a7e7403f7b3275c5a
    Signed-off-by: Lee Leahy 
    Reviewed-on: https://review.coreboot.org/14112
    Tested-by: build bot (Jenkins)
    Reviewed-by: Martin Roth

See https://review.coreboot.org/14112 for details.

-gerrit