TunerHAL fixes

TunerHAL expects Hz
Fix stopRecordThread race
Push segment000000.ts to device
getFrontendIdByType() should return INVALID_ID when no FE found

Bug: 201556155
Test: VtsHalTvTunerV1_{0,1}TargetTest on BCM device
Change-Id: Idab6817e47f3e10f07a36a8b2fd805336b9f0e5d
Signed-off-by: Pierre Couillaud <pierre@broadcom.com>