sunxi: add support for FriendlyARM NanoPi R1S H5

sunxi: add support for FriendlyARM NanoPi R1S H5

Specification:
  CPU: Allwinner H5, Quad-core Cortex-A53
  DDR3 RAM: 512MB
  Network: 10/100/1000M Ethernet x 2
  USB Host: Type-A x 1
  MicroSD Slot x 1
  MicroUSB: for power input
  Debug Serial Port: 3Pin pin-header
  LED: WAN, LAN, SYS
  KEY: Reset
  Power Supply: DC 5V/2A

Installation:
  Write the image to SD Card with dd.

Note:
  1. OpenWrt currently does not support LED_FUNCTION, change back to the
     previous practice (Consistent with NanoPi R1).
  2. Since the upstream commit https://github.com/torvalds/linux/bbc4d71
     ("net: phy: realtek: fix rtl8211e rx/tx delay config"), we need to
     change the phy-mode from rgmii to rgmii-id.
     So set phy-mode for 5.4 and 5.10 respectively.

Signed-off-by: Chukun Pan <amadeus@jmu.edu.cn>