drm/i915: Replace _MMIO_PHY3() with _PICK_EVEN_2RANGES()

As done previously for pll, also convert users of _PHY3() to
_PICK_EVEN_2RANGES(). Size comparison of i915.o:

	$ size build64/drivers/gpu/drm/i915/i915.o{.old,.new}
	   text    data     bss     dec     hex filename
	4026997  185703    6984 4219684  406324 build64/drivers/gpu/drm/i915/i915.o.old
	4026288  185703    6984 4218975  40605f build64/drivers/gpu/drm/i915/i915.o.new

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230120193457.3295977-5-lucas.demarchi@intel.com