arm: add support for arch timer

This patch add basic support for the architecture timer found on recent
ARMv7 based SoCs.

Signed-off-by: Vitaly Andrianov <vitalya@ti.com>
Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
diff --git a/arch/arm/cpu/armv7/Makefile b/arch/arm/cpu/armv7/Makefile
index 119ebb3..ab869b1 100644
--- a/arch/arm/cpu/armv7/Makefile
+++ b/arch/arm/cpu/armv7/Makefile
@@ -25,6 +25,7 @@
 
 obj-$(CONFIG_KONA) += kona-common/
 obj-$(CONFIG_OMAP_COMMON) += omap-common/
+obj-$(CONFIG_SYS_ARCH_TIMER) += arch_timer.o
 obj-$(CONFIG_TEGRA) += tegra-common/
 
 ifneq (,$(filter s5pc1xx exynos,$(SOC)))