drm/i915: split out i915_reg_read_ioctl() to i915_ioctl.[ch]

Add new files i915_ioctl.[ch] to hold small ioctls that are out of place
everywhere else, and not big enough to warrant a file of their own. For
starters, it's just for i915_reg_read_ioctl() that's a bit high level
for a low level implementation that intel_uncore.[ch] is.

Suggested-by: Tvrtko Ursulin <[email protected]>
Signed-off-by: Jani Nikula <[email protected]>
Reviewed-by: Tvrtko Ursulin <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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