sepolicy: update access policy for charger script

Currently qti_init_shell label is applied for init.qti.charger.sh
however the script filename is changed to init.qti.chg_policy.sh
under charger_monitor project. Hence update access policy for
init.qti.chg_policy.sh and move them to qva/vendor/common along
with "hvdcp_opti" which seems to be the proper place.

Change-Id: I86ec11c12593a76069fbdcf5ed41cc05359938ad