mx6slevk: 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>
diff --git a/board/freescale/mx6slevk/mx6slevk.c b/board/freescale/mx6slevk/mx6slevk.c
index 6ba604e..5eab4b5 100644
--- a/board/freescale/mx6slevk/mx6slevk.c
+++ b/board/freescale/mx6slevk/mx6slevk.c
@@ -520,8 +520,4 @@
 	/* load/boot image from boot device */
 	board_init_r(NULL, 0);
 }
-
-void reset_cpu(ulong addr)
-{
-}
 #endif