gps: report session begin/end on gps start/stop

Since modem does not consistently send
SESSON_END/ENGINE_OFF event, always report
SESSION_END on stop gps and SESSION_BEGIN on
start gps so that the icon is turned on/off
correctly.

CRs-fixed: 401664
Change-Id: Ib3954529056a653d7057aedb489be1ccee9eaf1d
(cherry picked from commit dc7abf9a3d621b7a744e0eaeb6d9819ffff869a5)
DevicePerformanceSettingsHelper: remove killall command

Change-Id: I714559eed58e537b8e0dae91d14e1356e5e680a1
selinux: add read to dhcp policy

Change-Id: If7a281ccf70670d95017caaf59b9d88527e8c156
fstab: specify ro for persist

/persist is failing to mount without the option

Change-Id: I6fe9ee1ddd93b615208b86fc2f5c2ed9ca0149f5
fstab: mount /persist rw

...so it can be relabeled by selinux

Change-Id: I0d99978e9e269e13beb5cd0c67521b11f919b51d
Merge pull request #10 from razrqcom-dev-team/cm-10.1

cm-10.1