MAINTAINERS: Add Andrei Kartashev

This adds Andrei Kartashev as a reviewer for meta-yadro layer.

Change-Id: I977dff3fb5f944e0361d5f4446488c18cd9e14e1
Signed-off-by: Alexander Filippov <a.filippov@yadro.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 276d9ea..6b1b602 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -45,3 +45,4 @@
 M:  Alexander Filippov <a.filippov@yadro.com> <nest1ing!>
 M:  Alexander Amelkin <a.amelkin@yadro.com> <AAmelkin_YADRO!>
 R:  Artem Senichev <artemsen@gmail.com> <artemsen!>
+R:  Andrei Kartashev <a.kartashev@yadro.com> <alatar!>