bootblock: Move function prototype

Change-Id: I01ecb9a16099ac6189ce3f0bdbd43c23ad7c621d
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/30488
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/include/bootblock_common.h

@@ -36,6 +36,7 @@ void bootblock_soc_init(void);
  * C code entry point for the boot block.
  */
 asmlinkage void bootblock_c_entry(uint64_t base_timestamp);
+asmlinkage void bootblock_c_entry_bist(uint64_t base_timestamp, uint32_t bist);
 
 /*
  * This is a the same as the bootblock main(), with the difference that it does