drm/i915: move and rename reg_in_range_table

drm/i915: move and rename reg_in_range_table

reg_in_range_table is a useful function that is used in multiple places,
and will be needed for WA_BB implementation later.

Let's move this function and i915_range struct to its own file, as we are
trying to move away from i915_utils files.

v2: move functions to their own file
v3: use correct naming convention

Suggested-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Matt Atwood <matthew.s.atwood@intel.com>
Link:
https://lore.kernel.org/r/20251009215210.41000-1-matthew.s.atwood@intel.com
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>