The ULT type of MPPs don't have a pullup. Skip configuring the
pullup on these types of pins.

Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: NStephen Boyd <sboyd@codeaurora.org>
Reviewed-by: NAndy Gross <andy.gross@linaro.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>