RISC-V: KVM: Reject vCPU creation after AIA initialization

AIA initialization sets up per-vCPU IMSIC state by iterating over all
online vCPUs. Creating another vCPU afterwards leaves it without
initialized IMSIC state, but KVM currently permits that sequence.

Reject KVM_CREATE_VCPU once AIA initialization succeeds. Both paths are
serialized by kvm->lock, so checking the initialized state from
kvm_arch_vcpu_precreate() freezes the vCPU set used by AIA.

Fixes: 89d01306e34d ("RISC-V: KVM: Implement device interface for AIA irqchip")
Signed-off-by: Andrew Jones <andrew.jones@oss.qualcomm.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260925160300.467884-1-andrew.jones@oss.qualcomm.com
Signed-off-by: Anup Patel <anup@brainfault.org>

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