pinctrl: imx8m: kconfig: Fix build error on test compile

PINCTRL_IMX depends on OF, however the dependency is missed when selected
by PINCTRL_IMX8M* (it does not follow the indirect 'select' statements),
select it explicitly.

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Linus Walleij <linus.walleij@linaro.org>
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/all/202209050605.fezJUgFH-lkp@intel.com/
Fixes: 87c2a29a ("pinctrl: imx8m: kconfig: Depends on SOC_IMX8M")
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Reviewed-by: Jacky Bai <ping.bai@nxp.com>
Link: https://lore.kernel.org/r/20220905224408.346425-1-francesco.dolcini@toradex.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/freescale/Kconfig

@@ -119,6 +119,7 @@ config PINCTRL_IMX7ULP
 
 config PINCTRL_IMX8MM
 	tristate "IMX8MM pinctrl driver"
+	depends on OF
 	depends on SOC_IMX8M
 	select PINCTRL_IMX
 	help
@@ -126,6 +127,7 @@ config PINCTRL_IMX8MM
 
 config PINCTRL_IMX8MN
 	tristate "IMX8MN pinctrl driver"
+	depends on OF
 	depends on SOC_IMX8M
 	select PINCTRL_IMX
 	help
@@ -133,6 +135,7 @@ config PINCTRL_IMX8MN
 
 config PINCTRL_IMX8MP
 	tristate "IMX8MP pinctrl driver"
+	depends on OF
 	depends on SOC_IMX8M
 	select PINCTRL_IMX
 	help
@@ -140,6 +143,7 @@ config PINCTRL_IMX8MP
 
 config PINCTRL_IMX8MQ
 	tristate "IMX8MQ pinctrl driver"
+	depends on OF
 	depends on SOC_IMX8M
 	select PINCTRL_IMX
 	help