drm/i915: Extract ilk_pch_get_config()

Pull the ilk+ PCH state readout into its own function and relocate
to the appropriate file.

The clock readout parts are perhaps a bit iffy since we depend
on the gmch DPLL readout code. But we can think about the clock
readout big picture later.

Cc: Dave Airlie <[email protected]>
Cc: Jani Nikula <[email protected]>
Signed-off-by: Ville Syrjälä <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Dave Airlie <[email protected]>

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