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/arch/powerpc/dts/Makefile b/arch/powerpc/dts/Makefile
index 26b592b..bb436f0 100644
--- a/arch/powerpc/dts/Makefile
+++ b/arch/powerpc/dts/Makefile
@@ -30,6 +30,7 @@
 dtb-$(CONFIG_TARGET_MCR3000) += mcr3000.dtb
 dtb-$(CONFIG_TARGET_GAZERBEAM) += gazerbeam.dtb
 dtb-$(CONFIG_TARGET_CMPC885) += cmpc885.dtb
+dtb-$(CONFIG_TARGET_CMPCPRO) += cmpcpro.dtb
 
 include $(srctree)/scripts/Makefile.dts