ARM: STi: Add STiH407 SoC support

This patch adds support to STiH407 SoC.

Acked-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com>

Documentation/arm/sti/stih407-overview.txt

@@ -0,0 +1,18 @@
+			STiH407 Overview
+			================
+
+Introduction
+------------
+
+    The STiH407 is the new generation of SoC for Multi-HD, AVC set-top boxes
+    and server/connected client application for satellite, cable, terrestrial
+    and IP-STB markets.
+
+    Features
+    - ARM Cortex-A9 1.5 GHz dual core CPU (28nm)
+    - SATA2, USB 3.0, PCIe, Gbit Ethernet
+
+  Document Author
+  ---------------
+
+  Maxime Coquelin <maxime.coquelin@st.com>, (c) 2014 ST Microelectronics