drm/crc-debugfs: User irqsafe spinlock in drm_crtc_add_crc_entry

We can be called from any context, we need to be prepared.

Noticed this while hacking on vkms, which calls this function from a
normal worker. Which really upsets lockdep.

Cc: Rodrigo Siqueira <[email protected]>
Cc: Tomeu Vizoso <[email protected]>
Cc: Emil Velikov <[email protected]>
Cc: Benjamin Gaignard <[email protected]>
Reviewed-by: Benjamin Gaignard <[email protected]>
Reviewed-by: Ville Syrjälä <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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