MAINTAINERS: Add entry for UniCore32

Signed-off-by: Andreas Färber <afaerber@suse.de>
Acked-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
diff --git a/MAINTAINERS b/MAINTAINERS
index f83d07c2..922945c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -112,6 +112,11 @@
 S: Maintained
 F: target-sparc/
 
+UniCore32
+M: Guan Xuetao <gxt@mprc.pku.edu.cn>
+S: Maintained
+F: target-unicore32/
+
 X86
 M: qemu-devel@nongnu.org
 S: Odd Fixes