pinctrl: berlin: select the pinctrl driver according to the SoC used

This patch prepares to remove the pinctrl driver selection from the
mach-berlin Kconfig. To do so, bool is replaced by def_bool.
Signed-off-by: Antoine Tenart <antoine.tenart@free-electrons.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/berlin/Kconfig

@@ -6,15 +6,15 @@ config PINCTRL_BERLIN
 	select REGMAP_MMIO
 
 config PINCTRL_BERLIN_BG2
-	bool
+	def_bool MACH_BERLIN_BG2
 	select PINCTRL_BERLIN
 
 config PINCTRL_BERLIN_BG2CD
-	bool
+	def_bool MACH_BERLIN_BG2CD
 	select PINCTRL_BERLIN
 
 config PINCTRL_BERLIN_BG2Q
-	bool
+	def_bool MACH_BERLIN_BG2Q
 	select PINCTRL_BERLIN
 
 config PINCTRL_BERLIN_BG4CT