packaging: Restrict kernel patches applied to top-level dir

The apply_patches.sh script applies all patches in the patches
directory,  as well as subdirectories. This means if there is a sub-dir
called "experimental" under a major kernel version directory,
experimental patches would be applied to the default kernel supported by
Kata.
We did not come accross this issue earlier as typically the experimental
kernel version was different from the default kernel.
With both the default kernel and the arm-experimental kernel having the
same major kernel version (5.15.x) at this time, trying to update the
kernel patch version revealed that arm-experimental patches were being
applied to the default kernel.

Restricting the patches to be applied to the top level directory will
solve the issue. The apply_patches script should ignore any
sub-directories meant for experimental patches.

Fixes #4520

Signed-off-by: Archana Shinde <archana.m.shinde@intel.com>

tools/packaging/scripts/apply_patches.sh

@@ -36,7 +36,7 @@ fi
 
 echo "INFO: Apply patches from $patches_dir"
 if [ -d "$patches_dir" ]; then
-	patches=($(find "$patches_dir" -name '*.patch'|sort -t- -k1,1n))
+	patches=($(find "$patches_dir" -maxdepth 1 -name '*.patch'|sort -t- -k1,1n))
 	echo "INFO: Found ${#patches[@]} patches"
 	for patch in ${patches[@]}; do
 		echo "INFO: Apply $patch"