wifi: cfg80211: fix bug of mapping AF3x to incorrect User Priority

wifi: cfg80211: fix bug of mapping AF3x to incorrect User Priority

According to RFC8325 4.3, Multimedia Streaming: AF31(011010, 26),
AF32(011100, 28), AF33(011110, 30) maps to User Priority = 4
and AC_VI (Video).

However, the original code remain the default three Most Significant
Bits (MSBs) of the DSCP, which makes AF3x map to User Priority = 3
and AC_BE (Best Effort).

Fixes: 6fdb8b8781d5 ("wifi: cfg80211: Update the default DSCP-to-UP mapping")
Signed-off-by: hhorace <hhoracehsu@gmail.com>
Reviewed-by: Guillaume Nault <gnault@redhat.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/20240807082205.1369-1-hhoracehsu@gmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>