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/pxamci.c b/drivers/mmc/host/pxamci.c
index f8985c5..ff96033 100644
--- a/drivers/mmc/host/pxamci.c
+++ b/drivers/mmc/host/pxamci.c
@@ -1,5 +1,5 @@
 /*
- *  linux/drivers/mmc/pxa.c - PXA MMCI driver
+ *  linux/drivers/mmc/host/pxa.c - PXA MMCI driver
  *
  *  Copyright (C) 2003 Russell King, All Rights Reserved.
  *