ARM: dts: msm: change hard reset behavior for PMI8994 and PMK8001 PON

As per hardware documentation, PON devices of both PMI8994 and
PMK8001 should be configured to shutdown when the system goes
for a hard reset. Change it.

CRs-Fixed: 953825
Change-Id: I151524b13a17f88c7a925ced57f9ca81b200c25c
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>