drivers/pc80/rtc: Reorganize prototypes

Change-Id: Idea18f437c31ebe83dd61a185e614106a1f8f976
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38199
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
diff --git a/src/lib/bootblock.c b/src/lib/bootblock.c
index 565d619..b3d4860 100644
--- a/src/lib/bootblock.c
+++ b/src/lib/bootblock.c
@@ -6,7 +6,7 @@
 #include <console/console.h>
 #include <delay.h>
 #include <option.h>
-#include <pc80/mc146818rtc.h>
+#include <post.h>
 #include <program_loading.h>
 #include <symbols.h>
 #include <timestamp.h>