scripts: Add qla2xxx upstream maintenance tooling

Track upstream imports, compare driver snapshots, audit remaining
source differences and export patches mapped to the SCST tree. Keep
review artifacts outside Git and expose unresolved changes for review.

Move the newer QLogic kernel patch helpers into scripts/kernel with
their callers and tests. Add the update skill and guide, preserving
separate commits for upstream imports and SCST adaptations.

scripts/kernel/generate-kernel-patch

@@ -28,6 +28,8 @@ set -o pipefail
 # shellcheck source=./kernel-functions
 source "$(dirname "$0")/kernel-functions"
 
+kernel_scripts=$(cd -- "$(dirname -- "$0")" && pwd) || exit $?
+
 function usage {
   echo "Usage: $0 [-d] [-h] [-n] [-p <dir>] [-s] [-u] <kernel version>"
   echo "where: "
@@ -539,7 +541,7 @@ if [ "${qla2x00t}" = "true" ]; then
 
 elif [ "${qla2x00t_32gbit}" = "true" ]; then
 
-  ( cd qla2x00t-32gbit && "$PWD/generate-in-tree-patches" "${full_kver}" ) || exit $?
+  ( cd qla2x00t-32gbit && "$kernel_scripts/generate-qla2xxx-in-tree-patches" "${full_kver}" ) || exit $?
 
   for f in qla2x00t-32gbit/in-tree-patches/"${krel}"/*.patch; do
     [ -e "$f" ] || continue