[MTD NAND] CAFÉ controller depends, perhaps unsurprisingly, on NAND

Noticed by Ingo.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index 358f55a..9326a56 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -223,7 +223,7 @@
 
 config MTD_NAND_CAFE
        tristate "NAND support for OLPC CAFÉ chip"
-       depends on PCI
+       depends on MTD_NAND && PCI
        help
 	 Use NAND flash attached to the CAFÉ chip designed for the $100
 	 laptop.