overlay: use config-based tcp buffer sizes

Change-Id: I05249cd35e3e44ee54d49040765e0067067cc70c
g3: update hardware key overlays

Change-Id: I68e8ce81ee5a709a7f765054b382eac61f95b747
Merge branch 'cm' into HEAD
Merge remote-tracking branch 'upstream/L5' into L5