If you look at TX1 camera module schematics, only VDD_CAM_1V8_CAM as 1.8V and VDD_CAM_FQ_HV_CAM are applied to the OV5693 module (J2). The OV5693 modules have 1.2V regulators for the OV5693 chips.
If you make your OV5693 modules, you may want to include 1.2V regulators.