mfd/tc35892: rename tc35892 core driver to tc3589x

Rename the tc35892 core/gpio drivers to tc3589x to include
new variants in the same mfd core

Acked-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Sundar Iyer <sundar.iyer@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 3a1493b..e8e704f 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -218,12 +218,12 @@
 		Keypad: stmpe-keypad
 		Touchscreen: stmpe-ts
 
-config MFD_TC35892
-	bool "Support Toshiba TC35892"
+config MFD_TC3589X
+	bool "Support Toshiba TC35892 and variants"
 	depends on I2C=y && GENERIC_HARDIRQS
 	select MFD_CORE
 	help
-	  Support for the Toshiba TC35892 I/O Expander.
+	  Support for the Toshiba TC35892 and variants I/O Expander.
 
 	  This driver provides common support for accessing the device,
 	  additional drivers must be enabled in order to use the