Add initial support for Pine64 board
with below features:
- U-Boot 2017.11
- Linux 4.14
- Default packages from buildroot
Cc: TL Lim <tllim@pine64.org>
Cc: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
