xfree86: Refine drm modes on continuous freq panel

Merged Aaron requested to merge Ma/xserver:master into master

EDID1.4 replaced GTF Bit with Continuous or Non-Continuous Frequency Display.

Check the "Display Range Limits Descriptor" for GTF support. If panel doesn't support GTF, then add gtf modes.

Otherwise X will only show the modes in "Detailed Timing Descriptor".

V2: Coding style changes.

BugLink: drm/intel#313 (closed) Signed-off-by: Aaron Ma aaron.ma@canonical.com

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