Import platform SDK from build 6922298

./update_prebuilts.py -p 6922298

Bug: 160453030
Test: build com.google.android.tethering from source and from prebuilts
-- no diff in badging

Merged-In: Iaf46b5e98a1ea0affe17aa2919454160d1b224fe
Change-Id: Icc8251b40e7a97a888c07c52c8e5ea6be5e42066
3 files changed