ARM: vexpress: refactoring of Versatile Express CA9x4 support

The current ca9x4_ct_vxp platform contains support for a Versatile
Express motherboard with a quad core A9 core tile.

This patch separates the Versatile Express motherboard code and the
A9 specific code, to ease supporting more core tiles in the next
patches.

Andre: merged the first two of Ryan's original patches and did some
checkpatch fixes.

Signed-off-by: Ryan Harkin <ryan.harkin@linaro.org>
Signed-off-by: Andre Przywara <andre.przywara@linaro.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index 2bd0a98..8fb01ef 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -967,7 +967,7 @@
 
 Matt Waddel <matt.waddel@linaro.org>
 
-	ca9x4_ct_vxp	ARM ARMV7 (Quad Core)
+	vexpress_ca9x4	ARM ARMV7 (Quad Core)
 
 Otavio Salvador <otavio@ossystems.com.br>