rockpi4 documentation fixes

building/devices/rockpi4.rst: The "RockPi4" wiki
page has been removed and combined with "Rock4" so
update our external link so it still works.

building/gits/build.rst: It looks like the commit that
added rockpi4 build documentation added Rock Pi 4 to the list/table
in "Platforms Supported" but did not add it the table in the
"Current Version" section. This PR adds it to the second table.

Signed-off-by: Sean Gilligan <sean@msgilligan.com>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
diff --git a/building/devices/rockpi4.rst b/building/devices/rockpi4.rst
index 3e04377..5c552a6 100644
--- a/building/devices/rockpi4.rst
+++ b/building/devices/rockpi4.rst
@@ -25,5 +25,5 @@
 
 
 .. _ROCK 4: https://wiki.radxa.com/Rock4
-.. _ROCK Pi 4: https://wiki.radxa.com/RockPi4
+.. _ROCK Pi 4: https://wiki.radxa.com/Rock4
 .. _serial console: https://wiki.radxa.com/Rockpi4/dev/serial-console
diff --git a/building/gits/build.rst b/building/gits/build.rst
index e151075..0c51247 100644
--- a/building/gits/build.rst
+++ b/building/gits/build.rst
@@ -197,6 +197,8 @@
 +----------------+-------------------+----------------------+
 | Raspberry Pi 3 | ``rpi3.xml``      | :ref:`rpi3`          |
 +----------------+-------------------+----------------------+
+| ROCK Pi 4      | ``rockpi4.xml``   | :ref:`rockpi4`       |
++----------------+-------------------+----------------------+
 | STM32MP1       | ``stm32mp1.xml``  | :ref:`stm32mp1`      |
 +----------------+-------------------+----------------------+
 | VCK190         | ``versal.xml``    | :ref:`versal`        |