drm/i915/rpm: Enable runtime pm autosuspend by default

Let's enable runtime pm autosuspend by default everywhere.
So, we can allow D3hot and bigger power savings on idle scenarios.

But at this time let's not touch the autosuspend_delay time,
what caused some regression on our previous attempt.

Also, the latest identified issue on GuC PM has been fixed by
commit 1a52fae ("drm/i915/guc: Take GT PM ref when deregistering
context")

v1: Enable runtime pm autosuspend by default for Gen12
and later versions.

v2: Enable runtime pm autosuspend by default for all
platforms(Syrjala Ville)

v3: Change commit message(Nikula Jani)

Signed-off-by: Tilak Tangudu <tilak.tangudu@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211116155238.3226516-1-tilak.tangudu@intel.com

drivers/gpu/drm/i915/intel_runtime_pm.c

@@ -600,6 +600,9 @@ void intel_runtime_pm_enable(struct intel_runtime_pm *rpm)
 		pm_runtime_use_autosuspend(kdev);
 	}
 
+	/* Enable by default */
+	pm_runtime_allow(kdev);
+
 	/*
 	 * The core calls the driver load handler with an RPM reference held.
 	 * We drop that here and will reacquire it during unloading in