drm/i915/icl: keep track of unused pll while looping
Instead of looping again on the range of plls, just keep track of one unused one and use it later. Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com> Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190125222444.19926-5-lucas.demarchi@intel.com
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