PM / Runtime: Update last_busy in rpm_resume

If we don't update last_busy in rpm_resume, devices can go back
to sleep immediately after resume. This happens at least in
cases where the device has been powered off and does not have
any interrupt pending until there's something in the FIFO.

Change-Id: Ic297628367418f67a099d9aa6780a25c759f2d7b
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: mydongistiny <jaysonedson@gmail.com>
Signed-off-by: Albert I <krascgq@outlook.co.id>