mainboard/pine64/rockpro64: Add initial ROCKPro64 support

This adds initial support for the Pine64 ROCKPro64 board.

The ROCKPro64 (http://pine64.org/rockpro64) is a SBC using the
RK3399 SoC with up to 4GB LPDDR4.

So far only the bootblock part works, the romstage starts to execute,
though.

For ramstage to work we'll need to port some of the changes required
for LPDDR4 vs LPDDR3. This will be addressed in follow up changes.

UART2 on the PI-2 connector can be used as a coreboot console.

  GND is pin 6
  TXD is pin 8
  RXD is pin 10

Flashing:
  I used an OpenWRT nightly for the ROCKPro64 and its builtin tool.

  $ mtd write coreboot.rom /dev/mtd0

Recovering from a bad flash:
  To recover from a bad flash bridging pins 23 and 25 on the PI-2
  connector will make the board boot from SD card.

Signed-off-by: Moritz Fischer <moritzf@google.com>
Change-Id: I47d0031fff8ee10b11ad74935eaeb05f1f7eb4b3
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50625
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

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