Add size check on PPS#policy

Bug: 275340417
Test: atest android.net.wifi
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:18df516b0270a9aceebf6a732a4c89827eafa801)
Merged-In: Iede626004a1ea46f47b185777c97794e4d3ded4e
Change-Id: Iede626004a1ea46f47b185777c97794e4d3ded4e
1 file changed