media: i2c: og01a1b: Switch from .s_stream to .enable_streams/.disable_streams

media: i2c: og01a1b: Switch from .s_stream to .enable_streams/.disable_streams

The change allows to simplify the driver code, in particular the explicit
locking scheme for stream on/off or format update serialization can be
dropped in favour to the one provided by the V4L2 core internals.

Signed-off-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
[Sakari Ailus: Fix error handling for enable_streams callback.]
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>