drivers/pc80/rtc: Clean up some headers

Change-Id: I5b3f1da6581dd80264aaa9618227ac64e1966e8d
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38180
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/include/fallback.h

@@ -1,13 +1,8 @@
 #ifndef FALLBACK_H
 #define FALLBACK_H
 
-#if !defined(__ASSEMBLER__)
-
 void boot_successful(void);
 void set_boot_successful(void);
-
-#endif /* __ASSEMBLER__ */
-
-#define RTC_BOOT_BYTE	48
+int do_normal_boot(void);
 
 #endif /* FALLBACK_H */