clk: impd1: Look up clock-output-names

The IM-PD1 still need to pass the clock output names.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lkml.kernel.org/r/20200416081348.326833-1-linus.walleij@linaro.org


Fixes: 84655b76 ("clk: versatile: Add device tree probing for IM-PD1 clocks")
Signed-off-by: Stephen Boyd <sboyd@kernel.org>