RISC-V: KVM: Use a raw lock for IMSIC wakeup state

kvm_riscv_vcpu_aia_imsic_put() can run from the scheduler preemption
notifier while the raw runqueue lock is held. Taking vsfile_lock, an
rwlock_t, there violates the lockdep wait-context rules.

Protect the CPU/HGEI pair with a separate raw spinlock. All updates to
that pair retain vsfile_lock and take the new lock, while scheduler-out
uses only the new lock around the HGEIE update. This keeps the wakeup
setup serialized with VS-file publication and release without bringing
wider IMSIC operations into a raw critical section.

Fixes: 4cec89db80ba ("RISC-V: KVM: Move HGEI[E|P] CSR access to IMSIC virtualization")
Signed-off-by: Andrew Jones <andrew.jones@oss.qualcomm.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260925155116.465203-1-andrew.jones@oss.qualcomm.com
Signed-off-by: Anup Patel <anup@brainfault.org>

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