dt-bindings: remoteproc: qcom: Add QMP property

Add Qualcomm Mailbox Protocol (QMP) property to replace the power domain
exposed by the AOSS QMP node.

Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/1631800770-371-4-git-send-email-sibis@codeaurora.org