aopen/dxplplusu: Switch to C_ENVIRONMENT_BOOTBLOCK

This board is the only user of these ancient chipsets,
so we'll do all in one go.

Also wipe out some extra headers.

Change-Id: I22c172d577e6072562d8fcfa58145ec62473823e
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/30688
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
diff --git a/src/southbridge/intel/i82801dx/bootblock.c b/src/southbridge/intel/i82801dx/bootblock.c
index 8ae419d..a5e48e5 100644
--- a/src/southbridge/intel/i82801dx/bootblock.c
+++ b/src/southbridge/intel/i82801dx/bootblock.c
@@ -11,9 +11,10 @@
  * GNU General Public License for more details.
  */
 
+#include <cpu/intel/car/bootblock.h>
 #include <arch/io.h>
 
-static void bootblock_southbridge_init(void)
+void bootblock_early_southbridge_init(void)
 {
 	/* Set FWH IDs for 2 MB flash part. */
 	if (CONFIG_ROM_SIZE == 0x200000)