soc/amd/common: Make agesa_heap_base non-static

The cbmem location holding the heap will be used to store additional
information in subsequent patches.  Remove the static designation from
agesa_heap_base.

Change-Id: Ic607432fd6500ef69b5d47793896cf12a699d8b7
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/22721
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
2 files changed