Update Xilinx maintainer details

This patch updates Xilinx maintainers details
as sorenb is no more the maintainer for xilinx
and the email id is invalid now.

Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
diff --git a/maintainers.rst b/maintainers.rst
index 701ea17..939543a 100644
--- a/maintainers.rst
+++ b/maintainers.rst
@@ -84,7 +84,7 @@
 Xilinx platform sub-maintainer
 ------------------------------
 
-Sören Brinkmann (soren.brinkmann@xilinx.com, `sorenb-xlnx`_)
+Siva Durga Prasad Paladugu (siva.durga.paladugu@xilinx.com, `sivadur`_)
 
 Files:
 
@@ -104,5 +104,5 @@
 .. _mtk09422: https://github.com/mtk09422
 .. _TonyXie06: https://github.com/TonyXie06
 .. _rkchrome: https://github.com/rkchrome
-.. _sorenb-xlnx: https://github.com/sorenb-xlnx
+.. _sivadur: https://github.com/sivadur
 .. _etienne-lms: https://github.com/etienne-lms