arm64: dts: qcom: milos-fairphone-fp6: Add Hall Effect sensor

arm64: dts: qcom: milos-fairphone-fp6: Add Hall Effect sensor

Add a node for the Hall Effect sensor, used to detect whether the Flip
Cover is closed or not.

The sensor is powered through vreg_l10b, so let's put a
regulator-always-on on that to make sure the sensor gets power.

Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260213-fp6-hall-sensor-v2-1-ecd113d4919c@fairphone.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>