drm/i915/dp: Check src/sink compressed bpp limit for edp

Use checks for src and sink limits before computing compressed bpp for
eDP.

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230817142459.89764-18-ankit.k.nautiyal@intel.com