Log message:
update rock*64 u-boot to the latest (1060-g56bd958253) from ayufan.

tested on rock64, works with rock64 v3.

Log message:
update pine64's rockpro64 to latest version from ayufan.

add u-boot package for rock64.  originally this was the same
as the old rockpro64 and works fine on that the rev2.0 board,
but didn't on rev3.0.  the updated version is still has a
problem, but at least gets further and has partition issues
instead of failing to talk to the sd at all.  share a bunch
of the makefile with rockpro64.

for all u-boot, properly fix the subst for tools/dtoc/dtoc.

add both rock64 and rockpro64 to the u-boot meta package and
bump the pkg revision.

Log message:
fix the previous.  probably worked on systems that exposed a
"python2" in the path somewhere.

now many the u-boot packages build again (not all were broken.)

Log message:
fix the python part for tools/dtoc/dtoc.py.  fixes uncommited rock64 build.

Log message:
Add u-boot for the Banana Pi BPI-M2 Zero and BPI-P2 Zero.

Log message:
Add a U-Boot package for the LeMaker Banana Pro.

Log message:
Add U-Boot for the Lamobo R1 (a.k.a. Bananapi BPI-R1).

Log message:
Make depending on u-boot for Meson-based boards optional, as they have
build-time dependencies not available on all platforms.

Log message:
Push the installboot.plist files down into a "files" directory in
the pkg source area, as per convention.

(No rev bump -- installed content hasn't changed.)

Log message:
Add support for installboot(8) overlays.