mtd/nand/r852: fix build for CONFIG_PCI disabled

r852 fails to build when CONFIG_PCI is not enabled since it uses
pci_*() calls and is a PCI driver, so it should depend on PCI
to prevent build errors.
It should also #include <linux/pci.h>.

drivers/mtd/nand/r852.c:1053: error: implicit declaration of function 'pci_prepare_to_sleep'
drivers/mtd/nand/r852.c:1062: error: implicit declaration of function 'pci_back_from_sleep'

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Maxim Levitsky <maximlevitsky@gmail.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

drivers/mtd/nand/Kconfig

@@ -105,6 +105,7 @@ config MTD_NAND_IDS
 config MTD_NAND_RICOH
 	tristate "Ricoh xD card reader"
 	default n
+	depends on PCI
 	select MTD_SM_COMMON
 	help
 	  Enable support for Ricoh R5C852 xD card reader

drivers/mtd/nand/r852.c

@@ -12,6 +12,7 @@
 #include <linux/jiffies.h>
 #include <linux/workqueue.h>
 #include <linux/interrupt.h>
+#include <linux/pci.h>
 #include <linux/pci_ids.h>
 #include <linux/delay.h>
 #include <asm/byteorder.h>