media: qcom: camss: csiphy-3ph: Fix inadvertent dropping of SDM660/SDM670 phy init

The moving of init sequence hook from gen2() to subdev_init() doesn't
account for gen1 devices such as SDM660 and SDM670. The switch should find
the right offset for gen2 PHYs only, not reject gen1. Remove the default
error case to restore gen1 CSIPHY support.

Cc: stable@vger.kernel.org
Fixes: fbce0ca2 ("media: qcom: camss: csiphy-3ph: Move CSIPHY variables to data field inside csiphy struct")
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
Signed-off-by: Bryan O'Donoghue <bod@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>