mx6sabresd: Remove empty reset_cpu()

There is really no need to provide an empty reset_cpu() implementation,
so just remove it.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Reviewed-by: Stefano Babic <sbabic@denx.de>

board/freescale/mx6sabresd/mx6sabresd.c

@@ -914,8 +914,4 @@ void board_init_f(ulong dummy)
 	/* load/boot image from boot device */
 	board_init_r(NULL, 0);
 }
-
-void reset_cpu(ulong addr)
-{
-}
 #endif