powerpc/t4rdb: Add support of CPLD

This support of CPLD includes

    - Files and register definitions
    - Command to switch alternate bank
    - Command to switch default bank

Signed-off-by: Chunhe Lan <Chunhe.Lan@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
diff --git a/board/freescale/t4rdb/Makefile b/board/freescale/t4rdb/Makefile
index f7f7fc0..3886e3d 100644
--- a/board/freescale/t4rdb/Makefile
+++ b/board/freescale/t4rdb/Makefile
@@ -5,6 +5,7 @@
 #
 
 obj-$(CONFIG_T4240RDB) += t4240rdb.o
+obj-y	+= cpld.o
 obj-y	+= ddr.o
 obj-y	+= eth.o
 obj-$(CONFIG_PCI)	+= pci.o