Patch merged into coreboot/master: cbmem: Always maintain backing store struct in a global on non-x86

the following patch was just integrated into master:
commit 3c814b2e2b8e053da352f4746a4914fb43af09d7
Author: Julius Werner 
Date:   Fri Aug 19 16:20:40 2016 -0700

cbmem: Always maintain backing store struct in a global on non-x86

The current CBMEM code contains an optimization that maintains the
    structure with information about the CBMEM backing store in a global
    variable, so that we don't have to recover it from cbmem_top() again
    every single time we access CBMEM. However, due to the problems with
    using globals in x86 romstage, this optimization has only been enabled
    in ramstage.

However, all non-x86 platforms are SRAM-based (at least for now) and
    can use globals perfectly fine in earlier stages. Therefore, this patch
    extends the optimization on those platforms to all stages. This also
    allows us to remove the requirement that cbmem_top() needs to return
    NULL before its backing store has been initialized from those boards,
    since the CBMEM code can now keep track of whether it has been
    initialized by itself.

Change-Id: Ia6c1db00ae01dee485d5e96e4315cb399dc63696
    Signed-off-by: Julius Werner 
    Reviewed-on: https://review.coreboot.org/16273
    Tested-by: build bot (Jenkins)
    Reviewed-by: Aaron Durbin

See https://review.coreboot.org/16273 for details.

-gerrit