imx: imx7d: add imx-common cpu support for imx7d

Add imx-common cpu support for imx7d SoC
- Update reset_cause for imx7d
- Enable watchdog driver built for imx7d

Signed-off-by: Adrian Alonso <aalonso@freescale.com>
Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
diff --git a/arch/arm/cpu/armv7/mx7/Makefile b/arch/arm/cpu/armv7/mx7/Makefile
new file mode 100644
index 0000000..e6ecef0
--- /dev/null
+++ b/arch/arm/cpu/armv7/mx7/Makefile
@@ -0,0 +1,8 @@
+#
+# (C) Copyright 2015 Freescale Semiconductor, Inc.
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+#
+
+obj-y	:= soc.o clock.o clock_slice.o