ARM: vexpress: create A5 specific board config

This patch creates a new config for the A5 dual core tile that includes the
generic config for the Versatile Express platform.

The generic config has been modified to provide support for the Extended
Memory Map, as used on the A5 core tile.  A5 does not support the legacy
memory map.

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 46ed51c..ab6ebe1 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -238,6 +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
+vexpress_ca5x2               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