pistachio: initialize cbmem area to be empty

Use cbmem_initialize_empty() after DDR configuration so that
cbmem is always initialized from scratch on each boot.

Change-Id: Ic9ca34867b26aab82cf3154280694b6fb61ee11f
Signed-off-by: Ionela Voinescu <ionela.voinescu@imgtec.com>
Reviewed-on: http://review.coreboot.org/10458
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins)
1 file changed