Samsung DTS ARM changes for 4.15

1. Add new board: Hardkernel Odroid HC1.
2. Fix incomplete Odroid-XU3/4 thermal-zones definition leading to
   possible overheat if first pair of A7+A15 cores is idle but rest of
   CPUs are busy.
3. Add capacity-dmips-mhz properties for CPUs of octa-core SoCs.
4. Add power button to Odroid XU3/4.
5. Improvements in Gscaler, HDMI and Mixer blocks on Exynos5.
6. Add suspend quirk to DWC3 USB controller to fix enumeration of
   SuperSpeed devices on Odroid XU4.
7. Add HDMI and MHL to Trats2.
8. Cleanups (redundant properties and nodes).