dt-bindings: media: qcom,sm8550-iris: document SA8775p IRIS accelerator

dt-bindings: media: qcom,sm8550-iris: document SA8775p IRIS accelerator

Document the IRIS video decoder and encoder accelerator found in the
SA8775p platform. SA8775p and SM8550 are irisv3 with same core and
bindings, hence SA8775p is made fallback to SM8550.
QCS8300 is a downscaled version of irisv3 and have different hardware
capabilities. SM8650 is an irisv3 with different (higher) number of
reset lines compared to SM8550. QCS8300 is yet to come in future
posting, while SM8650 is posted as
https://lore.kernel.org/all/20250305-topic-sm8x50-iris-v10-v2-1-bd65a3fc099e@linaro.org/

Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Vikash Garodia <quic_vgarodia@quicinc.com>
Signed-off-by: Bryan O'Donoghue <bod@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>