KVM: riscv: Avoid redundant interrupt check for pending timers

The kvm_vcpu_check_block() calls kvm_arch_vcpu_runnable() before
checking whether a timer is pending. On RISC-V, kvm_arch_vcpu_runnable()
already checks all pending guest interrupts through
kvm_riscv_vcpu_has_interrupts(vcpu, -1UL), including IRQ_VS_TIMER.

Drop the repeated IRQ_VS_TIMER pending-interrupt check from
kvm_riscv_vcpu_timer_pending() and keep the helper focused on the timer
deadline state. If the timer becomes pending after the runnable check,
the timer path still injects IRQ_VS_TIMER and kicks the vCPU through the
normal wakeup path.

Signed-off-by: Jinyu Tang <jinyu.tang@linux.dev>
Reviewed-by: Nutty Liu <nutty.liu@hotmail.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260814123541.593613-1-jinyu.tang@linux.dev
Signed-off-by: Anup Patel <anup@brainfault.org>

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