xtensa: enable plugin support

Compiler plugins can be built starting with xtensa gcc 12. Enable plugin
support for xtensa when gcc-12 or newer is used.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2022-03-19 05:49:24 -07:00
commit 7dc0eb0b6d