arm64: dts: qcom: qcs6490-rubikpi3: Add IMX219 camera overlays

RUBIK Pi 3 ships without camera sensors, and its two connectors support
multiple modules. Keep module-specific nodes out of the base board DTS
and add per-connector overlays for Raspberry Pi Camera Module V2 IMX219
sensors.

CAM1 uses CCI1 and CSIPHY1, while CAM2 uses CCI0 and CSIPHY4. Each
overlay describes the 24 MHz sensor input clock and models the module
power domain controlled through the connector PWR_EN signal. The
baseboard supplies VCC3V3_OUTPUT separately and has no per-camera
regulator.

Describe each connector CAMERA_GPIO signal as a privacy indicator LED
and associate it with the corresponding sensor. This lets the V4L2 core
control the LED while the sensor is streaming.

Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Hongyang Zhao <hongyang.zhao@thundersoft.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260812-rubikpi-next-20260615-v3-2-06e21232d8e4@thundersoft.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

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