arm64: dts: qcom: sdm632-fairphone-fp3: Enable modem

Add the necessary supplies and set an appropriete firmware-name for the
modem and enable it.

Signed-off-by: Luca Weiss <luca@lucaweiss.eu>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20250222-fp3-remoteprocs-firmware-v1-4-237ed21c334a@lucaweiss.eu


Signed-off-by: Bjorn Andersson <andersson@kernel.org>