drm/panfrost: Convert MMU IRQ handler to threaded handler

In preparation to handle mapping of page faults, we need the MMU handler
to be threaded as code paths take a mutex.

As the IRQ may be shared, we can't use the default handler and must
disable the MMU interrupts locally.

Cc: Tomeu Vizoso <[email protected]>
Cc: Boris Brezillon <[email protected]>
Cc: Robin Murphy <[email protected]>
Reviewed-by: Steven Price <[email protected]>
Acked-by: Alyssa Rosenzweig <[email protected]>
Signed-off-by: Rob Herring <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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