docs(layerscape): add ls1088a soc and board support

Update document for nxp-layerscape to add ls1088a SoC and ls1088ardb,
update maintainer of ls1088a platforms.

Signed-off-by: Jiafei Pan <Jiafei.Pan@nxp.com>
Change-Id: Ic7fdc7b1bbf22e50646991093366a88ee523ffe3
diff --git a/docs/about/maintainers.rst b/docs/about/maintainers.rst
index ad125cf..093fbe9 100644
--- a/docs/about/maintainers.rst
+++ b/docs/about/maintainers.rst
@@ -571,6 +571,14 @@
 :|F|: plat/nxp/soc-ls1046a/ls1046afrwy
 :|F|: plat/nxp/soc-ls1046a/ls1046aqds
 
+NXP SoC Part LS1088A and its platform port
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+:|M|: Jiafei Pan <jiafei.pan@nxp.com>
+:|G|: `JiafeiPan`_
+:|F|: plat/nxp/soc-ls1088a
+:|F|: plat/nxp/soc-ls1088a/ls1088ardb
+:|F|: plat/nxp/soc-ls1088a/ls1088aqds
+
 QEMU platform port
 ^^^^^^^^^^^^^^^^^^
 :|M|: Jens Wiklander <jens.wiklander@linaro.org>