mmc: update header file paths

Make sure all headers in the files reflect their true position
in the tree.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
diff --git a/drivers/mmc/host/au1xmmc.c b/drivers/mmc/host/au1xmmc.c
index 52b63f1..34c99d4 100644
--- a/drivers/mmc/host/au1xmmc.c
+++ b/drivers/mmc/host/au1xmmc.c
@@ -1,5 +1,5 @@
 /*
- * linux/drivers/mmc/au1xmmc.c - AU1XX0 MMC driver
+ * linux/drivers/mmc/host/au1xmmc.c - AU1XX0 MMC driver
  *
  *  Copyright (c) 2005, Advanced Micro Devices, Inc.
  *