[Thread] add Thread aconfig_declaration to java_sdk_library

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
diff --git a/common/OWNERS b/common/OWNERS
new file mode 100644
index 0000000..e7f5d11
--- /dev/null
+++ b/common/OWNERS
@@ -0,0 +1 @@
+per-file thread_flags.aconfig = file:platform/packages/modules/Connectivity:main:/thread/OWNERS