add OWNERS file for the threadnetwork HAL project

Test: N/A
Bug: 262471085
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:90bf9095167d0478c0ae4371ac82daf22a4efc73)
Merged-In: I024e7d5c1fe3adf7ae03f77d1580bd1f19f750c1
Change-Id: I024e7d5c1fe3adf7ae03f77d1580bd1f19f750c1
1 file changed