drm/i915: pass dev_priv explicitly to PSR_EVENT

Avoid the implicit dev_priv local variable use, and pass dev_priv
explicitly to the PSR_EVENT register macro.

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/9bc5819afa46416eb8f12ac050ed4d3bcde34b63.1714471597.git.jani.nikula@intel.com


Signed-off-by: Jani Nikula <jani.nikula@intel.com>