Add runtime DT support and documentation for the Cortex A7/A15 architected timers. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Conflicts: [Resolve conflicts for adding support for the feature ARCH_HAS_READ_CURRENT_TIMER] arch/arm/kernel/arch_timer.c Change-Id: I4b1d1dc2a8c69466497423475f7a3dd4d2c380c1 Signed-off-by: Sathish Ambley <sambley@codeaurora.org>