clk: ux500: ape[ate|trace]clk are scaleable

The APEATCLK and APETRACECLK are actually scaleable so register
them as scaleable clocks.

Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>