Add pinctrl configuration for gpio-keys. Without this,
camera button half-presses are not detected.

Tested on discovery and pioneer.

Fixes: e781633b ("arm64: dts: qcom: Add support for Sony Xperia XA2/Plus/Ultra (Nile platform)")
Signed-off-by: Sebastian Raase <linux@sraa.de>
Link: https://lore.kernel.org/r/20240315085934.1511722-1-linux@sraa.deSigned-off-by: Bjorn Andersson <andersson@kernel.org>