ROCK/POP Juice Newton: ''Can't Wait All Night.'' (RCA AFL1-4995.) - It's hard not to like this impeccably produced, albeit predictable, LP of country rock from Juice. ''Can't Wait All Night'' - the title track that is - is the quintessential gutsy torch song. It's got a nice propulsive feel, and, of course , singing that runs as clear and clean as a mountain stream. The next cut, ''Restless Heart,'' smoothly counterbalances. What more can you ask for? Perhaps some of that old fashioned creative spark - so much here seems carefully groomed for pop consumption. For a fine set of crisp, uncluttered songs with a mild country accent, however, here's your LP.