drm/msm/dp: pull I/O data out of msm_dp_catalog_private()

Having I/O regions inside a msm_dp_catalog_private() results in extra
layers of one-line wrappers for accessing the data. Move I/O region base
and size to the globally visible struct msm_dp_catalog.

Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Tested-by: Stephen Boyd <swboyd@chromium.org> # sc7180-trogdor
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/654319/
Link: https://lore.kernel.org/r/20250518-fd-dp-audio-fixup-v6-3-2f0ec3ec000d@oss.qualcomm.com