pkg/54704: u-boot: add support to Orange Pi PC

[kikadf.01%gmail.com@localhost]

>Number:         54704
>Category:       pkg
>Synopsis:       u-boot: add support to Orange Pi PC
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Sun Nov 17 13:30:00 +0000 2019
>Originator:     kikadf
>Release:        
>Organization:
>Environment:
>Description:
Xunlong Orange Pi PC is an Allwinner H3 based board[1], should works well with NetBSD[2], but no u-boot-orangepi-pc package in pkgsrc. 

[1] http://www.orangepi.org/orangepipc/
[2] http://wiki.netbsd.org/ports/evbarm/allwinner/
>How-To-Repeat:

>Fix: