Fix WWW in parent/child ports

Many of the WWW are overwritten later which means the wrong value
is used. This did not happen before where the children were either
 a) just using the pkg-descr from the parents
 b) or had their own separate pkg-descr with custom WWW

Use WWW?= in parents when the child's WWW is different.

Children that use the same WWW as the parent can just inherit it,
i.e., the child WWW can be removed.

Approved by:	portmgr (implicit)

Remove WWW entries moved into port Makefiles

Commit b7f05445c00f has added WWW entries to port Makefiles based on
WWW: lines in pkg-descr files.

This commit removes the WWW: lines of moved-over URLs from these
pkg-descr files.

Approved by:		portmgr (tcberner)

Add WWW entries to port Makefiles

It has been common practice to have one or more URLs at the end of the
ports' pkg-descr files, one per line and prefixed with "WWW:". These
URLs should point at a project website or other relevant resources.

Access to these URLs required processing of the pkg-descr files, and
they have often become stale over time. If more than one such URL was
present in a pkg-descr file, only the first one was tarnsfered into
the port INDEX, but for many ports only the last line did contain the
port specific URL to further information.

There have been several proposals to make a project URL available as
a macro in the ports' Makefiles, over time.

One more small cleanup, forgotten yesterday.
Reported by:	lwhsu

sysutils/u-boot-*: Update to 2021.04

Remove # $FreeBSD$ from Makefiles.

sysutils/atf: Update to v2.4

Bump u-boot ports that depends on it.
While here update the metadata and pkg-descr for the allwinner64 family so
u-boot is put in an alternate location that doesn't conflict with GPT
partitions.

Use HTTPS as possible

u-boot: Update to v2019.10

Update u-boot to its latest version.
For RK3399 we now use SPL+TPL from u-boot, no need for RockChip blob.
Remove one efi related patch that isn't needed anymore.

Tested-on: Pine64-LTS, Rock64, Rockpro64, BBB, RPI2, OrangePi One

sysutils/u-boot-firefly-rk3399: Bump portrevision as we now use miniloader

Since we now use the miniloader instead of SPL bump portrevision for this port.

sysutils/u-boot: Update to 2019.07

Remove one patch for RockChip RK3399 that was upstream.
Add a patch for storage api to remove SCSI. Allwinner A20 was converted
to DM_SCSI upstream and we don't have a good way to do what the api code
was doing (only had a brief look). This patch will probably be upstreamed
once I've found a better way. For now this means that you cannot boot from
SCSI drives using ubldr, using loader.efi will still work. Only Allwinner A20
boards are affected by this.

sysutils/u-boot: Update to 2019.04

Beaglebone slave port change its defconfig.
ZYNC related u-boot are broken.

u-boot-firefly-rk3399: Add a u-boot port for this board

This is a ARM64 board with a RockChip RK3399 SoC.

Add support for RK3399 to the u-boot-master port. No METADATA are created
for now as this u-boot is split in two file and we don't support this scheme
yet.
Two patch are needed :
 - One to allow booting u-boot proper from the same source as the DTS (accepted
 and merge upstream)
 - One to have the BL31 (ATF binary) path in a environment variable instead of
 in the source directory (accepted upstream).