add autopatch for linux drivers

Signed-off-by: Jai Luthra <me@jailuthra.in>

tools/autopatch/autopatch.sh

+#!/bin/bash
+
+set -euo pipefail
+
+(( $# == 2 )) || {
+    >&2 echo "Usage: $0 <patch-file.sh> <new-version>"
+    exit 2
+}
+
+patch_file=$1
+new_version=$2
+
+if [[ ! -e $patch_file ]]; then
+    >&2 echo "Patch file $patch_file not found"
+    exit 2
+fi
+
+# Find the latest patch line
+latest=$(grep -n "\s.*\[\".*\"\]='.*/g\?'" $patch_file | tail -1)
+
+# Find the line number to insert at
+line=$(cut -d : -f 1 <<<"$latest")
+line=$((line + 1))
+
+# Use the same bytecode, and escape it
+bytecode=$(cut -d = -f 2 <<<"$latest")
+bytecode=$(printf '%s\n' "$bytecode" | sed -e 's/[]\/$*.^[]/\\&/g');
+
+# Insert bytecode
+sed -i "${line} i \ \ \ \ [\"${new_version}\"]=${bytecode}" $patch_file