ARM: vexpress: add support for Versatile Express Cortex-A15-TC2

This adds support for the Cortex-A15-TC2 core tile for the Versatile
Express board by ARM. This is mostly a copy of the A5 support file,
but will be extended later with A15 specific options.

Signed-off-by: Andre Przywara <andre.przywara@linaro.org>
diff --git a/boards.cfg b/boards.cfg
index ab6ebe1..22ab6ad 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_ca15_tc2            arm         armv7       vexpress            armltd
 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