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/boards.cfg b/boards.cfg
index c99bab8..46ed51c 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -238,7 +238,7 @@
 versatileqemu                arm         arm926ejs   versatile           armltd         versatile   versatile:ARCH_VERSATILE_QEMU,ARCH_VERSATILE_PB
 integratorap_cm946es         arm         arm946es    integrator          armltd         -               integratorap:CM946ES
 integratorcp_cm946es         arm         arm946es    integrator          armltd         -               integratorcp:CM946ES
-ca9x4_ct_vxp                 arm         armv7       vexpress            armltd
+vexpress_ca9x4               arm         armv7       vexpress            armltd
 am335x_evm                   arm         armv7       am335x              ti             am33xx      am335x_evm:SERIAL1,CONS_INDEX=1
 am335x_evm_spiboot           arm         armv7       am335x              ti             am33xx      am335x_evm:SERIAL1,CONS_INDEX=1,SPI_BOOT
 am335x_evm_uart1             arm         armv7       am335x              ti             am33xx      am335x_evm:SERIAL2,CONS_INDEX=2