ARM: dts: msm: Add hard reset property for PM8909 PON peripheral

Define the qcom,store-hard-reason-reason property in the PM8909 PON
device so that a reset reason can be stored into a spare register
of the PON peripheral. This enables hard resets in scenarios
where warm resets would otherwise be necessary.

Change-Id: I1f674212af1ca2d62444aea72378b996b53d7c88
Signed-off-by: Srinivasarao Pathipati <spathi@codeaurora.org>