board: cssi: Add CPU board CMPCPRO

CSSI has another CPU board, similar to the CMPC885 board
that get plugged on the two base boards MCR3000_2G and MIAE.

That CPU board is called CMPCPRO because it has a MPC8321E CPU,
also known as Power QUICC II PRO.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
diff --git a/board/cssi/MAINTAINERS b/board/cssi/MAINTAINERS
index d8e7b5e..f82dd3b 100644
--- a/board/cssi/MAINTAINERS
+++ b/board/cssi/MAINTAINERS
@@ -6,3 +6,5 @@
 F:	configs/MCR3000_defconfig
 F:	include/configs/cmpc885.h
 F:	configs/CMPC885_defconfig
+F:	include/configs/cmpcpro.h
+F:	configs/CMPCPRO_defconfig