fix(dracut): when aggressive strip is enabled, don't apply to ko

Unlike ordinary binaries, kernel module will be unusable if stripped
with "-p". Fix this by always use "-g" only.

So far it didn't cause many issues since most kernels have their
modules signed or compressed so this is skipped.

Signed-off-by: Kairui Song <kasong@tencent.com>

dracut.sh

@@ -2111,6 +2111,7 @@ if [[ $do_strip == yes ]]; then
         fi
     done
 
+    kstrip_args=(-g)
     if [[ $aggressive_strip == yes ]]; then
         # `eu-strip` and `strip` both strips all unneeded parts by default
         strip_args=(-p)
@@ -2260,7 +2261,7 @@ if [[ $do_strip == yes ]] && ! [[ $DRACUT_FIPS_MODE ]]; then
         | while read -r -d $'\0' f || [ -n "$f" ]; do
             SIG=$(tail -c 28 "$f" | tr -d '\000')
             [[ $SIG == '~Module signature appended~' ]] || { printf "%s\000" "$f"; }
-        done | xargs -r -0 $strip_cmd "${strip_args[@]}"
+        done | xargs -r -0 $strip_cmd "${kstrip_args[@]}"
     dinfo "*** Stripping files done ***"
 fi