drm/i915: Handle cdclk crawling flag in standard manner

The 'has_cdclk_crawl' field in our device info structure is a boolean
flag and doesn't need a whole u8.  Add it as another 1-bit feature flag
and move it to the display section.  While we're at it, replace the
has_cdclk_crawl() function with a macro for consistency with our
handling of other feature flags.

Cc: Stanislav Lisovskiy <[email protected]>
Signed-off-by: Matt Roper <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Jani Nikula <[email protected]>

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