ARM: sunxi: remove empty #ifdef/endif block

Whatever code this was guarding has been removed so remove the guards
too.
Signed-off-by: NChris Packham <judge.packham@gmail.com>

arch/arm/mach-sunxi/board.c

@@ -207,9 +207,6 @@ void s_init(void)
 	eth_init_board();
 }
 
-#ifdef CONFIG_SPL_BUILD
-#endif
-
 /* The sunxi internal brom will try to loader external bootloader
  * from mmc0, nand flash, mmc2.
  */