Enforce missing permission getCameraDisabled

Add following checks:
* Caller has cross user permission if user other than caller is queried
* If componentName is specified than it belongs to the caller.

Also, Merged security exceptions in getCallerIdentity, as there was a
information leak. From different security exceptions it could be
deduced if particular package is admin package.

Bug: 193033501
Test: atest MixedProfileOwnerHostSideTransferTest#testTransferPolicies
      atest OrgOwnedProfileOwnerTest#testCameraDisabledOnParentIsEnforced
      atest ManagedProfileTest#testCameraPolicy
      atest MixedDeviceOwnerTest#testSetCameraDisabledLogged
      atest MixedProfileOwnerTest#testSetCameraDisabledLogged
      atest MixedManagedProfileOwnerTest#testSetCameraDisabledLogged
      atest com.android.server.devicepolicy.DevicePolicyManagerTest#testDaDisallowedPolicies_SecurityException
      atest com.android.server.devicepolicy.DevicePolicyManagerTest#testGetMacAddress
Change-Id: I521ffd81f93c5c2576e9324152856b4a4933c094