pinctrl: msm: Update Kconfig for PINCTRL_MSM8X74

Add GPIOLIB and OF as dependencies for PINCTRL_MSM8X74, to fix
build errors from i386-randconfig.
Also add help text and make the entries tristate, while touching
these entries.

Cc: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: NBjorn Andersson <bjorn.andersson@sonymobile.com>
[Rebased on top of pin control development branch]
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/Kconfig

@@ -204,15 +204,18 @@ config PINCTRL_IMX28
 	select PINCTRL_MXS
 
 config PINCTRL_MSM
-	bool
+	tristate
 	select PINMUX
 	select PINCONF
 	select GENERIC_PINCONF
 
 config PINCTRL_MSM8X74
-	bool "Qualcomm 8x74 pin controller driver"
-	depends on OF && OF_IRQ
+	tristate "Qualcomm 8x74 pin controller driver"
+	depends on GPIOLIB && OF && OF_IRQ
 	select PINCTRL_MSM
+	help
+	  This is the pinctrl, pinmux, pinconf and gpiolib driver for the
+	  Qualcomm TLMM block found in the Qualcomm 8974 platform.
 
 config PINCTRL_NOMADIK
 	bool "Nomadik pin controller driver"