arm64: dts: qcom: qcm6490-fairphone-fp5: Prefix regulator-fixed label

Add the common vreg_ prefix to the labels of the regulator-fixed. Also
make sure the nodes are sorted alphabetically.

Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250103-fp5-cam-eeprom-v1-4-88dee1b36f8e@fairphone.com


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