codeowners: Add myself to gdbstub

Add myself as code owner for gdbstub.

Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
diff --git a/CODEOWNERS b/CODEOWNERS
index 72f2f64..52af7d1 100644
--- a/CODEOWNERS
+++ b/CODEOWNERS
@@ -371,6 +371,7 @@
 /include/tracing/                         @wentongwu @nashif
 /include/debug/                           @nashif
 /include/debug/coredump.h                 @dcpleung
+/include/debug/gdbstub.h                  @ceolin
 /include/device.h                         @wentongwu @nashif
 /include/devicetree.h                     @galak
 /include/display/                         @vanwinkeljan
@@ -480,6 +481,8 @@
 /subsys/cpp/                              @pabigot @vanwinkeljan
 /subsys/debug/                            @nashif
 /subsys/debug/coredump/                   @dcpleung
+/subsys/debug/gdbstub/                    @ceolin
+/subsys/debug/gdbstub.c                   @ceolin
 /subsys/dfu/                              @nvlsianpu
 /subsys/tracing/                          @nashif @wentongwu
 /subsys/debug/asan_hacks.c                @vanwinkeljan @aescolar @daor-oti