gpio: rename gpio-langwell to gpio-intel-mid

gpio-langwell is a deprecated name. Despite the driver was made
initially for Langwell, it supports now other Intel Mid SoC's.

This patch does no change beside the file renaming with Kconfig/Makefile
update.

Signed-off-by: David Cohen <david.a.cohen@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index c8b02a5..92e258c 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -621,12 +621,12 @@
 
 	  If unsure, say N
 
-config GPIO_LANGWELL
-	bool "Intel Langwell/Penwell GPIO support"
+config GPIO_INTEL_MID
+	bool "Intel Mid GPIO support"
 	depends on PCI && X86
 	select IRQ_DOMAIN
 	help
-	  Say Y here to support Intel Langwell/Penwell GPIO.
+	  Say Y here to support Intel Mid GPIO.
 
 config GPIO_PCH
 	tristate "Intel EG20T PCH/LAPIS Semiconductor IOH(ML7223/ML7831) GPIO"