media: atomisp: ov2680: Switch over to ACPI powermanagement

The DSDT of all Windows BYT / CHT devices which I have seen has proper
ACPI powermagement for the clk and regulators used by the sensors.

So there is no need for the whole custom atomisp_gmin custom code to
disable the ACPI pm and directly poke at the PMIC for this.

Replace all the atomisp_gmin usage with using the new
atomisp_register_sensor_no_gmin() / atomisp_unregister_subdev()
helpers which allow registering a sensor with the atomisp code
without using any of the atomisp_gmin power-management code.

Note eventually these calls should be replaced by the standard
v4l2_async_register_subdev_sensor() mechanism.

But this first requires a bunch of work to the atomisp main code
to make it set the necessary fwnodes up, similar to how
drivers/media/pci/intel/ipu3/cio2-bridge.c does this.

This has been tested on:
-Trekstor Surftab duo W1 10.1, CHT, AXP288 PMIC, 2x ov2680 sensor
-Asus T101HA, CHT, TI PMIC, 1x ov2680 sensor
-MPMAN Converter 9, BYT, AXP288 PMIC, ov2680 back, gc0310 front sensor

Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

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