MTD: handle pci_name() being const

This changes the MTD core to handle pci_name() now returning a constant
string.

Cc: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 245f909..8b5d491 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -121,7 +121,7 @@
 	u_int32_t oobavail;  // Available OOB bytes per block
 
 	// Kernel-only stuff starts here.
-	char *name;
+	const char *name;
 	int index;
 
 	/* ecc layout structure pointer - read only ! */