Allow system_app to interact with Dumpstate HAL

To let end user enable/disable the verbose vender logging,
a developer option is added into Settings app which need
directly interact with Dumpstate HAL. In the future, the
same function may be added into SystemUI, eg. as a
QuickSettings tile.

To allow both Settings app and system.ui, system_app is
the best candidate for the sepolicy change.

Bug: 148822215
Test: make && make RunSettingsRoboTests
Change-Id: Ic6ef497505719e07cc37518b78c9dc146cda2d2c
1 file changed