drm/i915: Convert PALETTE() to _PICK_EVEN_2RANGES()

PALETTE() can use _PICK_EVEN_2RANGES instead of _PICK, which
reduces the size and is safer.

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Anusha <Srivatsa&lt;anusha.srivatsa@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230120193457.3295977-9-lucas.demarchi@intel.com