drm/i915/psr: CAN_PSR and CAN_PANEL_REPLAY can be now local defines

CAN_PSR and CAN_PANEL_REPLAY are not used outside intel_psr.c anymore. Make
them as intel_psr.c local defines.

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240109100517.1947414-3-jouni.hogander@intel.com