codeowners: add getopt library

Add owner for newly created getopt library.
Extend ownership of fnmatch library.

Signed-off-by: Jakub Rzeszutko <[email protected]>

Author: Jakub Rzeszutko

CODEOWNERS

@@ -456,7 +456,9 @@
 /include/toolchain/                       @dcpleung @nashif @andyross
 /include/zephyr.h                         @dcpleung @nashif @andyross
 /kernel/                                  @dcpleung @nashif @andyross
-/lib/fnmatch/                             @carlescufi
+/lib/util/                                @carlescufi @jakub-uC
+/lib/util/fnmatch/                        @carlescufi @jakub-uC
+/lib/util/getopt/                         @jakub-uC
 /lib/gui/                                 @vanwinkeljan
 /lib/open-amp/                            @arnopo
 /lib/os/                                  @dcpleung @nashif @andyross