Doc Rivers & Trump's Friendship is Over ... He's With Hillary

Guessing the days of fancy steak dinners together are over -- because L.A. Clippers President Doc Rivers says he's NOT voting for his (ex?) pal Donald Trump.

Remember, Rivers and Trump used to be pretty friendly -- and had a chummy meal together at swanky Boa Steakhouse on the Sunset Strip just last year.

But that was before Donald announced his decision to run for president ... a decision that has seemingly cost him his friendship with Rivers.