Check sdk level in SetFlagsRule

This change makes SetFlagsRule to check sdk level. If the sdk level is
lower than V then the test will be skipped.

Test: Test the tool on a U device
Bug: 335666574
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:a46fdb0ccdc1ab04ce28b22bf6cc8961dc9265c4)
Merged-In: Icf0bc5d6f3b517210c87ddcf185e673a42308e46
Change-Id: Icf0bc5d6f3b517210c87ddcf185e673a42308e46
1 file changed