sysutils/u-boot-pinebookpro: Add new port

This is a u-boot slave port for the Pine64 PineBookPro, an RK3399
ARM64 laptop.
The patches have been submitted upstream and will probably be part
of the next u-boot release, but add the port in the meantime in case
anyone wants to start testing/dev FreeBSD on this laptop.
It doesn't have video support for now so one want to use a serial
cable.

sysutils/Makefile

@@ -1362,6 +1362,7 @@
     SUBDIR += u-boot-pine64
     SUBDIR += u-boot-pine64-lts
     SUBDIR += u-boot-pinebook
+    SUBDIR += u-boot-pinebookpro
     SUBDIR += u-boot-qemu-arm
     SUBDIR += u-boot-riotboard
     SUBDIR += u-boot-rock64

sysutils/u-boot-pinebookpro/Makefile

@@ -0,0 +1,16 @@
+# $FreeBSD$
+
+MASTERDIR=	${.CURDIR}/../u-boot-master
+
+MODEL=		pinebookpro
+BOARD_CONFIG=	pinebook-pro-rk3399_defconfig
+FAMILY=		rk3399
+
+PATCHFILES+=	1273633/raw \
+		1273674/raw \
+		1273675/raw \
+		1273676/raw \
+		1273677/raw \
+		1273678/raw
+
+.include "${MASTERDIR}/Makefile"

sysutils/u-boot-pinebookpro/pkg-descr

@@ -0,0 +1,7 @@
+U-Boot loader and related files for the Pine64 RockPro64.
+
+To install this bootloader on an sdcard just do:
+dd if=/usr/local/share/u-boot/u-boot-rockpro64/idbloader.img of=/path/to/sdcarddevice seek=64 bs=512 conv=sync
+dd if=/usr/local/share/u-boot/u-boot-rockpro64/u-boot.itb of=/path/to/sdcarddevice seek=16384 bs=512 conv=sync
+
+WWW: https://www.denx.de/wiki/U-Boot