The family of Deputy Ryan Clinkunbroomer, who was killed Sept. 16 just outside the Palmdale Sheriff’s Station where he worked, is filing a $20 million claim against L.A. County and the city of Palmdale that could be a precursor to a lawsuit, according to documents obtained by The Signal. Law enforcement officials believe Clinkunbroomer, a Santa Clarita Valley resident, was shot and killed by Kevin Cataneo Salazar after the deputy exited the sta…