pinctrl: berlin: add explicit dependency on OF

Berlin pinctrl drivers depends on CONFIG_OF. This patch adds
this dependency explicitly.
Signed-off-by: Antoine Tenart <antoine.tenart@free-electrons.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/berlin/Kconfig

@@ -7,14 +7,17 @@ config PINCTRL_BERLIN
 
 config PINCTRL_BERLIN_BG2
 	def_bool MACH_BERLIN_BG2
+	depends on OF
 	select PINCTRL_BERLIN
 
 config PINCTRL_BERLIN_BG2CD
 	def_bool MACH_BERLIN_BG2CD
+	depends on OF
 	select PINCTRL_BERLIN
 
 config PINCTRL_BERLIN_BG2Q
 	def_bool MACH_BERLIN_BG2Q
+	depends on OF
 	select PINCTRL_BERLIN
 
 config PINCTRL_BERLIN_BG4CT