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/cpu/qemu-x86/bootblock.c

@@ -18,8 +18,6 @@
 #include <console/console.h>
 #include <cpu/x86/bist.h>
 
-asmlinkage void bootblock_c_entry_bist(uint64_t base_timestamp, uint32_t bist);
-
 asmlinkage void bootblock_c_entry_bist(uint64_t base_timestamp, uint32_t bist)
 {
 	post_code(0x05);