drm/i915: pass dev_priv explicitly to EDP_PSR_PERF_CNT

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

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/21805960967ab88c1418037b98fe3e051eb00608.1714471597.git.jani.nikula@intel.com


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