soc: qcom: Add pm_stay_awake and pm_relax for FSA4480

Fsa driver schedules work to send usbc plug event notificaions
to mbhc but does not hold the system supend.
Add pm calls to hold system suspend
until mbhc notification is complete.

Change-Id: I31116844c592a8d2525605036cb7f0588aadf11f
Signed-off-by: Vatsal Bucha <vbucha@codeaurora.org>