mb/lowrisc/nexys4ddr: Initialize CBMEM in romstage

Change-Id: Ic1706ae8ab3cbef8f445d70cb78fa9d3301d87be
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-on: https://review.coreboot.org/17707
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
1 file changed