rust: sync: Add SpinLockIrq

A variant of SpinLock that is expected to be used in noirq contexts, so
lock() will disable interrupts and unlock() (i.e. `Guard::drop()` will
undo the interrupt disable.

[Boqun: Port to use spin_lock_irq_disable() and
spin_unlock_irq_enable()]

Signed-off-by: Lyude Paul <lyude@redhat.com>
Co-Developed-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>