dt-bindings: arm: qcom: Document qcs9100-ride and qcs9100-ride Rev3

dt-bindings: arm: qcom: Document qcs9100-ride and qcs9100-ride Rev3

Document qcs9100-ride and qcs9100-ride Rev3 is based on QCS9100 SoC.

QCS9100 is a IoT version of SA8775p, hence use the latter's compatible
string as fallback.

Signed-off-by: Tengfei Fan <quic_tengfan@quicinc.com>
Reviewed-by: Konrad Dybcio <konradybcio@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20240911-add_qcs9100_support-v2-3-e43a71ceb017@quicinc.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>