pinctrl: pinconf-generic: print hex value

Hex value will be easier to match hardware register bits layout,
so same as pinconf_generic_dump_config, print hex value.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Message-ID: <20240412005128.2937486-1-peng.fan@oss.nxp.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>