drm/panthor: Keep interrupts masked until they are needed

The autogenerated panthor_request_xx_irq() helpers unmask Mali
interrupts before we're sure we'll have a handler registered. For
non-shared IRQ lines, that's fine, but for shared ones, it might cause
an interrupt flood if the HW block raises an interrupt for any reason.

We could reworking the calls in panthor_request_xx_irq(), but it's just
simpler to let the caller decide when they are ready to handle interrupts
and call panthor_pwr_irq_resume() themselves. While at it, rework the
prototype to let users call panthor_pwr_irq_enable_events() explicitly
instead of passing an initial mask to panthor_request_pwr_irq().

Fixes: 5fe909cae118 ("drm/panthor: Add the device logical block")
Reported-by: Shashiko <sashiko-bot@kernel.org>
Closes: https://sashiko.dev/#/patchset/20260623-panthor-signal-from-irq-v3-0-2ece396f8ee0@collabora.com?part=3
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Karunika Choo <karunika.choo@arm.com>
Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>
Link: https://patch.msgid.link/20260625-panthor-misc-fixes-v1-11-b67ed973fea6@collabora.com

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