sb/amd/cimx/sb800/early.c: Drop unused 'include <cbmem.h>

Change-Id: I0e641197119588ccf090dad2950282f54ccbd208
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31857
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/southbridge/amd/cimx/sb800/early.c

@@ -18,7 +18,6 @@
 #include "SBPLATFORM.h"
 #include "sb_cimx.h"
 #include "cfg.h"		/*sb800_cimx_config*/
-#include "cbmem.h"
 
 /**
  * @brief South Bridge CIMx romstage entry,