ARM: dts: qcom: Remove stroring the hard-reset-reason in PON register

9x07 does not use the PON reason to determine the restart-reason.
Remove the DT property which enables this feature.

Change-Id: I429c53e0f703ca2310c53cbea0bd33dd1caa803c
Signed-off-by: Prasadarao Durvasula <pdurvasu@codeaurora.org>
Signed-off-by: Sivasri Kumar Vanka <sivasri@codeaurora.org>