drm/panthor: Keep the reset work disabled until everything is initialized

drm/panthor: Keep the reset work disabled until everything is initialized

The reset work will sub-component reset helpers, which might not be
ready if the reset happens during initialization, leading to NULL
pointer dereferences or worse.

Avoid that by keeping the reset work disabled while we're initializing
those sub-components.

Fixes: 5fe909cae118 ("drm/panthor: Add the device logical block")
Reported-by: sashiko-bot@kernel.org
Closes: https://sashiko.dev/#/patchset/20260625-panthor-signal-from-irq-v5-0-8836a74e0ef9@collabora.com?part=4
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.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-v1-2-b67ed973fea6@collabora.com