Motorola Solutions, the radio and public safety company, was split from the phone company shortly before Google purchased the phones in 2012.
There's no way the largest provider of police radios in the US and EU would be owned by a Chinese company.
Motorola Mobility was purchased by Google in 2011 and sold to Lenovo in 2014. Motorola Mobility is still based in the US but is well integrated as Lenovo's mobile division. The devices are made by Lenovo with their in-house assembly/manufacturing and external supply chain rather than the typical setup of a western company paying another company to build devices for them.
Motorola Mobility sells smartphones and tablets mainly via retail. Motorola Solutions sells cameras, radios and drones mainly via government contracts. They're entirely separate companies with no business partnership. Motorola Mobility can use the Motorola brand for anything but Motorola Solutions would need to pay for a license to use it for new product lines.
Also, Motorola Mobility would have no obligation to accept it.
https://www.sec.gov/Archives/edgar/data/1495569/000119312510...