drm/i915: Add _PICK_EVEN_2RANGES()

It's a constant pattern in the driver to need to use 2 ranges of MMIOs
based on port, phy, pll, etc. When that happens, instead of using
_PICK_EVEN(), _PICK() needs to be used.  Using _PICK() is discouraged
due to some reasons like:

1) It increases the code size since the array is declared
   in each call site
2) Developers need to be careful not to incur an
   out-of-bounds array access
3) Developers need to be careful that the indexes match the
   table. For that it may be that the table needs to contain
   holes, making (1) even worse.

Add a variant of _PICK_EVEN() that works with 2 ranges and selects which
one to use depending on the index value.

v2: Fix the address expansion in the example (Anusha)
v3: Also rename macro to _PICK_EVEN_2RANGES() in the documentation
    and reword it to clarify what ranges are chosen based on the index
    (Jani)

Signed-off-by: Lucas De Marchi <[email protected]>
Reviewed-by: Anusha Srivatsa <[email protected]>
Acked-by: Jani Nikula <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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