x86: Remove the prototype for the unused function board_init

Signed-off-by: Gabe Black <gabeblack@chromium.org>
diff --git a/arch/x86/include/asm/u-boot-x86.h b/arch/x86/include/asm/u-boot-x86.h
index accc8fa..d3e2f4c 100644
--- a/arch/x86/include/asm/u-boot-x86.h
+++ b/arch/x86/include/asm/u-boot-x86.h
@@ -42,7 +42,6 @@
 int cpu_init_interrupts(void);
 
 /* board/.../... */
-int board_init(void);
 int dram_init(void);
 
 void setup_pcat_compatibility(void);