dt-bindings: qpnp-smb5: Add property to enable thermal mitigation

Add DT properties to enable thermal mitigation for triple
charging in CC mode. In thermal mitigation, thermal status
of main charger, SMB, skin and connector are polled
periodically and power supply change event is generated to
notify userspace.

Change-Id: I431605ea961796184c237ead127b628fe18f3e32