Optimize ActiveServices targetSdkVersion fetch

Rather than fetching the entire AppInfo object, call the method for
specifically getting the targetSdkVersion.

In this specific case, match flags and user ID can both be ignored as
only 1 physical APK for each package name is allowed on the device, so
as long as the caller has package visibility, the targetSdkVersion
returned is guaranteed to be the right one.

Bug: 219481486

Test: presubmit

Change-Id: I1d8c155e9be9b80da0af241273ceb9cf3564d917
1 file changed