mx6sxsabresd: 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>

board/freescale/mx6sxsabresd/mx6sxsabresd.c

@@ -598,8 +598,4 @@ void board_init_f(ulong dummy)
 	/* load/boot image from boot device */
 	board_init_r(NULL, 0);
 }
-
-void reset_cpu(ulong addr)
-{
-}
 #endif