Samsung DTS ARM changes for v5.14

1. Several cleanups and alignment with dtschema.  This includes removal
   of unused properties and fixing LED brightness property.
2. Enable PMIC RTC interrupt as a wakeup source (intended to wakeup for
   example from Suspend to RAM where the PMIC RTC's power is still
   supplied).
3. Disable unused/not implemented camera on GT-I9100.