docs(maintainers): add the maintainers for imx8ulp

Add the maintainers for NXP i.MX8ULP.

Signed-off-by: Jacky Bai <ping.bai@nxp.com>
Change-Id: Ifc5f86ad6eb7288ef28765311fc3b1ff48031df5
diff --git a/docs/about/maintainers.rst b/docs/about/maintainers.rst
index 4531a03..355129c 100644
--- a/docs/about/maintainers.rst
+++ b/docs/about/maintainers.rst
@@ -646,6 +646,13 @@
 :|F|: docs/plat/imx8m.rst
 :|F|: plat/imx/imx8m/
 
+NXP i.MX8ULP platform port
+^^^^^^^^^^^^^^^^^^^^^^^^^^
+:|M|: Jacky Bai <ping.bai@nxp.com>
+:|G|: `JackyBai`_
+:|F|: docs/plat/imx8ulp.rst
+:|F|: plat/imx/imx8ulp/
+
 NXP i.MX9 platform port
 ^^^^^^^^^^^^^^^^^^^^^^^^
 :|M|: Jacky Bai <ping.bai@nxp.com>