media: qcom: camss: change internals of endpoint parsing to fwnode handling

media: qcom: camss: change internals of endpoint parsing to fwnode handling

Since a few called V4L2 functions operate with fwnode arguments the change
from OF device nodes to fwnodes brings a simplification to the code.

The camss_parse_endpoint_node() function is called once by camss_probe(),
and there is no use of knowing a number of asynchronously registered
remote devices, so it makes sense to remove the related computation from
the function.

Tested-by: Loic Poulain <loic.poulain@oss.qualcomm.com>
Signed-off-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
Signed-off-by: Bryan O'Donoghue <bod@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>