spi/topcliff_pch: support new device ML7213 IOH

Support ML7213 device of OKI SEMICONDUCTOR.
ML7213 is companion chip of Intel Atom E6xx series for IVI(In-Vehicle Infotainment).
ML7213 is compatible for Intel EG20T PCH.

v4: - Delete unrelated whitespace
    - Prevent device driver from accessing platform data
    - Add __devinit and __devexit
    - Save pdev->dev to pd_dev->dev.parent
    - Have own suspend/resume processing in platform_driver.
    - Care returned value in pch_spi_init
    - Change unregister order
Signed-off-by: NTomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>

drivers/spi/Kconfig

@@ -371,12 +371,15 @@ config SPI_TI_SSP
 	  serial port.
 
 config SPI_TOPCLIFF_PCH
-	tristate "Topcliff PCH SPI Controller"
+	tristate "Intel EG20T PCH/OKI SEMICONDUCTOR ML7213 IOH SPI controller"
 	depends on PCI
 	help
 	  SPI driver for the Topcliff PCH (Platform Controller Hub) SPI bus
 	  used in some x86 embedded processors.
 
+	  This driver also supports the ML7213, a companion chip for the
+	  Atom E6xx series and compatible with the Intel EG20T PCH.
+
 config SPI_TXX9
 	tristate "Toshiba TXx9 SPI controller"
 	depends on GENERIC_GPIO && CPU_TX49XX