pinctrl: bcm: add OF dependencies

Building without CONFIG_OF gives us these warnings for the broadcom
pinctrl drivers:

drivers/pinctrl/bcm/pinctrl-nsp-mux.c:356:20: error: 'pinconf_generic_dt_node_to_map_group' undeclared here (not in a function)
drivers/pinctrl/bcm/pinctrl-cygnus-mux.c:739:20: error: 'pinconf_generic_dt_node_to_map_group' undeclared here (not in a function)

The function is only available when CONFIG_OF is set, so we should add
a Kconfig dependency for both drivers.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: cc4fa83f66e9 ("pinctrl: nsp: add pinmux driver support for Broadcom NSP SoC")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/bcm/Kconfig

@@ -60,6 +60,7 @@ config PINCTRL_IPROC_GPIO
 config PINCTRL_CYGNUS_MUX
 	bool "Broadcom Cygnus IOMUX driver"
 	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
+	depends on OF
 	select PINMUX
 	select GENERIC_PINCONF
 	default ARCH_BCM_CYGNUS
@@ -103,6 +104,7 @@ config PINCTRL_NS2_MUX
 config PINCTRL_NSP_MUX
 	bool "Broadcom NSP IOMUX driver"
 	depends on (ARCH_BCM_NSP || COMPILE_TEST)
+	depends on OF
 	select PINMUX
 	select GENERIC_PINCONF
 	default ARCH_BCM_NSP