AppOps: remove uid control mechanism for default behavior

Many pre-installed apps' uid are less than FIRST_APPLICATION_UID.
These kind of apps will be allowed for strict operations by
default. This breaks some rules about pre-installed apps.

Need remove this UID control mechanism and add trusted apps in
whiltelist instead.

Change-Id: I561dbe6bacd9df3d9ea8bdbc0da2d5b2f791aece