ppc: Remove T4160RDB board

This board has not been converted to CONFIG_DM_PCI by the deadline and is
also missing conversion to CONFIG_DM.  Remove it.  As this is the last
ARCH_T4160 platform, remove that support as well.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/ddr/fsl/Kconfig b/drivers/ddr/fsl/Kconfig
index e6a51f5..8246f62 100644
--- a/drivers/ddr/fsl/Kconfig
+++ b/drivers/ddr/fsl/Kconfig
@@ -44,8 +44,7 @@
 			ARCH_P4080	|| \
 			ARCH_P5040	|| \
 			ARCH_LX2160A	|| \
-			ARCH_LX2162A	|| \
-			ARCH_T4160
+			ARCH_LX2162A
 	default 1
 
 config SYS_FSL_DDR_VER