mfd: Fix lpc_sch related depends/selects, fix build error

LPC_SCH is selected by GPI_SCH and I2C_ISCH, even when PCI is not
enabled, but LPC_SCH depends on PCI, so make GPI_SCH and I2C_ISCH
also depend on PCI.

Those 2 selects also need to select what LPC_SCH selects,
since kconfig does not follow selects.

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Denis Turischev <denis@compulab.co.il>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 60cb363..fee678f 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -96,7 +96,8 @@
 
 config GPIO_SCH
 	tristate "Intel SCH GPIO"
-	depends on GPIOLIB
+	depends on GPIOLIB && PCI
+	select MFD_CORE
 	select LPC_SCH
 	help
 	  Say yes here to support GPIO interface on Intel Poulsbo SCH.