MT#55283 remove bullseye backports manipulation

Bullseye has debhelper 13, so nothing to do in the backports script

Change-Id: If9aa0f1bf25805b7c1913cee6d0feb3afd002c6d
(cherry picked from commit 6432a45228)

pkg/deb/backports/bullseye

@@ -11,19 +11,6 @@ fi
 rm -rf ${DIST}
 cp -r debian ${DIST}
 
-# Update for bullseye debhelper
-sed -i -e 's/debhelper-compat.*/debhelper-compat (= 12),/' ${DIST}/control
-# Replace execute_* hooks with old-style overrides
-sed -i -e 's/^execute_after_dh_installsystemd:/override_dh_installsystemd:\n\tdh_installsystemd/' ${DIST}/rules
-sed -i -e 's/^execute_before_dh_auto_install-indep:/override_dh_auto_install-indep:/' ${DIST}/rules
-sed -i -e '/^\tgzip -9 < README.md/a\\n\tdh_auto_install' ${DIST}/rules
-# Add dwz override
-cat >> ${DIST}/rules <<'EOF'
-
-override_dh_dwz:
-	# Disable, as dwz cannot cope with some of the plugins generated.
-EOF
-
 if command -v wrap-and-sort &>/dev/null ; then
   wrap-and-sort -sat -d ${DIST}
 else