drm/bridge: dw-hdmi: Simplify clock handling

Make use of devm_clk_get_enabled() to replace devm_clk_get() and
clk_prepare_enable() for isfr and iahb clocks, and drop the now
unnecessary calls to clk_disable_unprepare().

Similarly, use devm_clk_get_optional_enabled() helper for cec clock,
which additionally allows to remove the -ENOENT test.

Moreover, the clock related members of struct dw_hdmi are not required
anymore, hence drop them.

Signed-off-by: Cristian Ciocaltea <[email protected]>
Reviewed-by: Robert Foss <[email protected]>
Signed-off-by: Robert Foss <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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