can: Kconfig: add more information about Intel EG20T PCH CAN controller

Current menu description, not easy to understand what the description
means. So, add information about the device.
Signed-off-by: Tomoya MORINAGA <tomoya.rohm@gmail.com>
[mkl: Added space before opening parentheses in Kconfig.
      Make commit message more descriptive.]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/Kconfig

@@ -103,11 +103,11 @@ config CAN_FLEXCAN
 	  Say Y here if you want to support for Freescale FlexCAN.
 
 config PCH_CAN
-	tristate "PCH CAN"
+	tristate "Intel EG20T PCH CAN controller"
 	depends on CAN_DEV && PCI
 	---help---
-	  This driver is for PCH CAN of Topcliff which is an IOH for x86
-	  embedded processor.
+	  This driver is for PCH CAN of Topcliff (Intel EG20T PCH) which
+	  is an IOH for x86 embedded processor (Intel Atom E6xx series).
 	  This driver can access CAN bus.
 
 source "drivers/net/can/mscan/Kconfig"