drm/i915: extract intel_bios.h functions from i915_drv.h
It used to be handy that we only had a couple of headers, but over time
i915_drv.h has become unwieldy. Extract declarations to a separate
header file corresponding to the implementation module, clarifying the
modularity of the driver.
Ensure the header remains self-contained, and do so with minimal further
includes, using forward declarations as needed.
No functional changes.
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/cf9b17d56489e15d82356575037432ad04712475.1556540890.git.jani.nikula@intel.com
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