sepolicy: Fix 'avc denied' issues for the emulators

This commit fixes the avc denied issues in the emulators:
- goldfish_setup is granted for network access
- netd dontaudit for sys_module
- qemu_prop is granted domain for get_prop

Critical issue was that SELinux denied reading the lcd_density property
by SurfaceFlinger via qemu_prop and this commit fixes it.

Change-Id: I633d96f4d2ee6659f18482a53e21f816abde2a5f
Signed-off-by: Miroslav Tisma <miroslav.tisma@imgtec.com>