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)

src/soc/imgtec/pistachio/romstage.c

@@ -18,6 +18,7 @@
  * Foundation, Inc.
  */
 
+#include <cbmem.h>
 #include <program_loading.h>
 #include <console/console.h>
 #include <halt.h>
@@ -30,6 +31,12 @@ void main(void)
 	error = init_ddr2();
 
 	if (!error) {
+		/*
+		 * When romstage is running it's always on the reboot path and
+		 * never a resume path where cbmem recovery is required.
+		 * Therefore, always initialize the cbmem area to be empty.
+		 */
+		cbmem_initialize_empty();
 		run_ramstage();
 	}
 	halt();