Mainline trunk stable flag must specify is_fixed_read_only: true since
server-side flags not supported for mainline in the trunk stable infrastructure
as of now.
Change-Id: Ibb2d599ee655f871f08b36bbc3cd6e286cf0d3c8
Test: TH
This commit also moves Thread flags to Connectivity/common to ease
maintenance.
Test: m framework-connectivity-t
Bug: 317290555
Merged-In: I50f3d3b8205a5a9ee8154a649318a2c175edbb71
Merged-In: I8a71f4ee49cc68a9512f432e454469200f2a5058
Change-Id: I8a71f4ee49cc68a9512f432e454469200f2a5058