clk/exynos5420: fix the order of parents of hdmi mux

Listing sclk_hdmiphy at 0th position in the list of parents is
causing wrong configuration in reg SRC_DISP10.

Signed-off-by: Rahul Sharma <rahul.sharma@samsung.com>
Acked-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>