[coreboot] Patch merged into coreboot/master: b313e90 armv7: init stack to 0xdeadbeef to detect stack overflows

the following patch was just integrated into master:
commit b313e90162fcc305178d26408533b183ce045965
Author: David Hendricks 
Date:   Fri Feb 15 17:50:20 2013 -0800

armv7: init stack to 0xdeadbeef to detect stack overflows

This adds a simple loop which initializes the stack to 0xdeadbeef
    which is used by checkstack().

Change-Id: I8aecf7bfb1067de68c4080c1fcb7eefa28fd04a7
    Signed-off-by: David Hendricks 
    Reviewed-on: http://review.coreboot.org/2421
    Tested-by: build bot (Jenkins)
    Reviewed-by: Paul Menzel

Build-Tested: build bot (Jenkins) at Mon Feb 18 23:56:19 2013, giving +1
See http://review.coreboot.org/2421 for details.

-gerrit