Added new dtsi flag 'qcom,suspend-ignore-children', to ignore
dependencies on children by runtime PM framework, this helps to
exit quickly from msm_geni_serial_runtime_suspend and save power.
Change-Id: Ib048c96952871e39286b3a4ce660e39d7cfa5465
Signed-off-by: Prasanna S <quic_prass@quicinc.com>