pinctrl: meson: add pinconf support

Adding pinconf support is necessary to enable boot from SPI
without breaking the eMMC. When booting from SPI, the ROM code
leave pull downs on the eMMC pad.

We need to set pinconf provided in DT to solve this

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
[narmstrong: added missing comma in pinctrl-meson-axg-pmx.c]
diff --git a/drivers/pinctrl/meson/Kconfig b/drivers/pinctrl/meson/Kconfig
index ee820a5..162642d 100644
--- a/drivers/pinctrl/meson/Kconfig
+++ b/drivers/pinctrl/meson/Kconfig
@@ -2,6 +2,7 @@
 
 config PINCTRL_MESON
 	select PINCTRL_GENERIC
+	select PINCONF
 	bool
 
 config PINCTRL_MESON_GX_PMX