sun50i: h5: Add initial Orangepi Prime support

sun50i: h5: Add initial Orangepi Prime support

Orangepi Prime is an open-source single-board computer
using the Allwinner h5 SOC.

H5 Orangepi Prime has
- Quad-core Cortex-A53
- 2GB DDR3
- Debug TTL UART
- 1000M/100M Ethernet RJ45
- Three USB 2.0
- HDMI
- Audio and MIC
- Wifi + BT
- IR receiver
- HDMI
- Wifi + BT

Boot from MMC:
-------------
U-Boot SPL 2017.05-00662-ga3f4c05-dirty (May 25 2017 - 13:30:14)
DRAM: 2048 MiB
Trying to boot from MMC1
NOTICE:  BL3-1: Running on H5 (1718) in SRAM A2 (@0x44000)
NOTICE:  Configuring SPC Controller
NOTICE:  BL3-1: v1.0(debug):aa75c8d
NOTICE:  BL3-1: Built : 18:28:27, May 24 2017
INFO:    BL3-1: Initializing runtime services
INFO:    BL3-1: Preparing for EL3 exit to normal world
INFO:    BL3-1: Next image address: 0x4a000000, SPSR: 0x3c9

U-Boot 2017.05-00662-ga3f4c05-dirty (May 25 2017 - 13:30:14 +0000) Allwinner Technology

CPU:   Allwinner H5 (SUN50I)
Model: OrangePi Prime
DRAM:  2 GiB
MMC:   SUNXI SD/MMC: 0
*** Warning - bad CRC, using default environment

In:    serial
Out:   serial
Err:   serial
Net:   phy interface7
eth0: ethernet@1c30000
starting USB...
USB0:   USB EHCI 1.00
USB1:   USB OHCI 1.0
scanning bus 0 for devices... 1 USB Device(s) found
       scanning usb for storage devices... 0 Storage Device(s) found
Hit any key to stop autoboot:  0

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>