KVM: arm/arm64: Initialize the emulated EL1 physical timer

Initialize the emulated EL1 physical timer with the default irq number.

Signed-off-by: Jintack Lim <jintack@cs.columbia.edu>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>