KVM: arm/arm64: Rename soft timer to bg_timer

As we are about to introduce a separate hrtimer for the physical timer,
call this timer bg_timer, because we refer to this timer as the
background timer in the code and comments elsewhere.

Signed-off-by: Christoffer Dall <cdall@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>

include/kvm/arm_arch_timer.h

@@ -43,7 +43,7 @@ struct arch_timer_cpu {
 	struct arch_timer_context	ptimer;
 
 	/* Background timer used when the guest is not running */
-	struct hrtimer			timer;
+	struct hrtimer			bg_timer;
 
 	/* Work queued with the above timer expires */
 	struct work_struct		expired;