drm/i915: convert _MMIO_PIPE3()/_MMIO_PORT3() to accept base

drm/i915: convert _MMIO_PIPE3()/_MMIO_PORT3() to accept base

Most users of _MMIO_PIPE3() and _MMIO_PORT3() need to add the MMIO base
to the registers. Convert the macros to _MMIO_BASE_PIPE3() and
_MMIO_BASE_PORT3() to move the base addition until after the register
selection. If the register address depends on DISPLAY_MMIO_BASE(), this
removes the need to figure the base out for each register, and it only
needs to be added once.

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/4b95f125f5021abc00b5fc661b2728f1b583c01e.1713890614.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>