MAINTAINERS: Add header files to Block Layer Core section

Suggested-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index b3552b2..9ff7c36 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -785,6 +785,7 @@
 F: block*
 F: block/
 F: hw/block/
+F: include/block/
 F: qemu-img*
 F: qemu-io*
 F: tests/qemu-iotests/