dt-bindings: soc: qcom: Add qcom,pbs bindings

Add binding for the Qualcomm Programmable Boot Sequencer device.

Signed-off-by: Anjelique Melendez <quic_amelende@quicinc.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240201204421.16992-4-quic_amelende@quicinc.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>