media: atomisp: csi2-bridge: Set PMC clk-rate for sensors to 19.2 MHz

The ACPI code takes care of enabling/disabling the PMC clk(s) for
the sensors as necessary based on the runtime-pm state of the sensor.

But the GMIN code this replaces also set the clk-rate of the PMC clk
to 19.2 MHz. At least on BYT devices the PMC clks may come up running
at 25 MHz instead of the expected 19.2 MHz.

Ensure the sensor clk also runs at the expected 19.2 MHz for sensors
using v4l2-async probing by explicitly setting it to 19.2 MHz when
enumerating sensors in atomisp_csi2_bridge.c.

Link: https://lore.kernel.org/r/20230529103741.11904-22-hdegoede@redhat.com

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

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