UPSTREAM: drm/i915/dp_mst: Fix BW limit check when calculating DSC DPT bpp

The DSC DPT bpp limit check should only fail if the available DPT BW is
less than the required BW, fix the check accordingly.

Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240416221010.376865-4-imre.deak@intel.com


(cherry picked from commit 1ff65bf8)

BUG=b:332903004, b:322223603
TEST=Verify Dell U3224KB 6k mode on Rex using UHBR, MST encoder, Big
     Joiner, and DSC

Change-Id: I0f1e2b05e4a7a445ac15bc9d00e935bda142d148
Signed-off-by: Rakshith M O <rakshith.m.o@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/5802884


Reviewed-by: Sean Paul <sean@poorly.run>
Reviewed-by: Manasi Navare <navaremanasi@chromium.org>
Signed-off-by: Hubert Mazur <hmazur@google.com>