alpha: make irqflags helpers operate on IPL state

Alpha interrupt masking is controlled by the PAL IPL value, not by the
full processor status word.  Make arch_local_save_flags() return the
current IPL directly, and make arch_local_irq_restore() and
arch_irqs_disabled_flags() treat their argument as IPL state.

Mask the low IPL bits in the restore and test helpers so callers which
still pass a saved PS value continue to behave as expected.

This prepares the irqflags helpers for lockdep IRQ-state tracking, where
the saved flags value is used to determine whether hard IRQs are enabled
or disabled.

Reviewed-by: Matt Turner <mattst88@gmail.com>
Tested-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Magnus Lindholm <linmag7@gmail.com>
Link: https://lore.kernel.org/r/20260706170019.2941459-4-linmag7@gmail.com
Signed-off-by: Magnus Lindholm <linmag7@gmail.com>

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