ARM: meson: add Beelink GS-King X board

The Beelink GS-King X is a variant of the GS King boards but with an internal
USB to SATA bridge and advanced audio features.

[narmstrong: add missing CONFIG_SYS_LOAD_ADDR from defconfig]
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/board/amlogic/beelink-s922x/MAINTAINERS b/board/amlogic/beelink-s922x/MAINTAINERS
index 7f223df..47b6227 100644
--- a/board/amlogic/beelink-s922x/MAINTAINERS
+++ b/board/amlogic/beelink-s922x/MAINTAINERS
@@ -5,5 +5,6 @@
 F:	board/amlogic/beelink-s922x/
 F:	configs/beelink-gtking_defconfig
 F:	configs/beelink-gtkingpro_defconfig
+F:	configs/beelink-gsking-x_defconfig
 F:	doc/board/amlogic/beelink-gtking.rst
 F:	doc/board/amlogic/beelink-gtkingpro.rst