clk: gemini: Read status before using the value

The probe does a shift and mask of val without having read it from the hardware.

Fixes: 846423f9 ("clk: Add Gemini SoC clock controller")
Signed-off-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>