pinctrl: th1520: add a CONFIG_OF dependency

When compile-testing without CONfIG_OF:

drivers/pinctrl/pinctrl-th1520.c: In function 'th1520_pinctrl_dt_node_to_map':
drivers/pinctrl/pinctrl-th1520.c:455:23: error: implicit declaration of function 'pinconf_generic_parse_dt_config'; did you mean 'pinconf_generic_dump_config'? [-Wimplicit-function-declaration]
  455 |                 ret = pinconf_generic_parse_dt_config(child, pctldev, &configs, &nconfigs);
      |                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                       pinconf_generic_dump_config

Enforce this using Kconig dependencies.

Fixes: bed5cd6 ("pinctrl: Add driver for the T-Head TH1520 SoC")
Signed-off-by: Arnd Bergmann <[email protected]>
Acked-by: Drew Fustini <[email protected]>
Link: https://lore.kernel.org/[email protected]
Signed-off-by: Linus Walleij <[email protected]>

Author: arndb

drivers/pinctrl/Kconfig

@@ -564,6 +564,7 @@ config PINCTRL_TPS6594
 config PINCTRL_TH1520
 	tristate "Pinctrl driver for the T-Head TH1520 SoC"
 	depends on ARCH_THEAD || COMPILE_TEST
+	depends on OF
 	select GENERIC_PINMUX_FUNCTIONS
 	select GENERIC_PINCONF
 	select PINMUX