docs(layerscape): add ls1046a soc and board support

Update document for nxp-layerscape to add ls1046a SoC and ls1046ardb,
ls1046afrwy board support.

Also update maintainer of ls1046a platforms.

Signed-off-by: Jiafei Pan <Jiafei.Pan@nxp.com>
Change-Id: I522f978bc93aa8d1f1d60fa8efef392b7d854df7
diff --git a/docs/about/maintainers.rst b/docs/about/maintainers.rst
index e0a7587..69aad08 100644
--- a/docs/about/maintainers.rst
+++ b/docs/about/maintainers.rst
@@ -561,6 +561,15 @@
 :|F|: plat/nxp/soc-ls1043a
 :|F|: plat/nxp/soc-ls1043a/ls1043ardb
 
+NXP SoC Part LS1046A and its platform port
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+:|M|: Jiafei Pan <jiafei.pan@nxp.com>
+:|G|: `JiafeiPan`_
+:|F|: plat/nxp/soc-ls1046a
+:|F|: plat/nxp/soc-ls1046a/ls1046ardb
+:|F|: plat/nxp/soc-ls1046a/ls1046afrwy
+:|F|: plat/nxp/soc-ls1046a/ls1046aqds
+
 QEMU platform port
 ^^^^^^^^^^^^^^^^^^
 :|M|: Jens Wiklander <jens.wiklander@linaro.org>