Add size check on PPS#policy

Bug: 275340417
Test: atest android.net.wifi
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:1fefc4c0995aabba6fd966bde9bf48dc24cb41b2)
Merged-In: Iede626004a1ea46f47b185777c97794e4d3ded4e
Change-Id: Iede626004a1ea46f47b185777c97794e4d3ded4e
1 file changed