drm/i915: Refactor LPT-H VGA dotclock disabling
Extract the LPT-H VGA dotclock disable to a separate function in anticipation of further use. While at it move the sb_lock locking inwards when enabling the VGA dotclock, as it's only needed to protect the sideband accesses. v2: Keep the PIXCLK_GATE_GATE name for 0 (Paulo) Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1449260494-14449-1-git-send-email-ville.syrjala@linux.intel.com
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