kunit: tool: Import missing importlib.abc

Python 3.10.0 contains:
9e09849d20 ("bpo-41006: importlib.util no longer imports typing (GH-20938)")

It causes importlib.util to no longer import importlib.abs, which leads
to the following error when trying to use kunit with qemu:
AttributeError: module 'importlib' has no attribute 'abc'. Did you mean: '_abc'?

Add the missing import.

Signed-off-by: Michał Winiarski <[email protected]>
Reviewed-by: Daniel Latypov <[email protected]>
Reviewed-by: Brendan Higgins <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>

Author: mwiniars

tools/testing/kunit/kunit_kernel.py

@@ -6,6 +6,7 @@
 # Author: Felix Guo <[email protected]>
 # Author: Brendan Higgins <[email protected]>
 
+import importlib.abc
 import importlib.util
 import logging
 import subprocess