Documentation: DT: qcom_hidma: update binding for MSI

Adding a new binding for qcom,hidma-1.1 to distinguish HW supporting
MSI interrupts from the older revision.

Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>