Add myself and Venkatesh Yadav Abbarapu as code owners for Xilinx platforms

Jolly left the company and Siva (DP) has moved to different possition
that's why it is necessary to change code ownership.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Change-Id: I546d9a0f7a2abd0c7a65be807725bc609160f3b2

docs/about/maintainers.rst

@@ -529,8 +529,10 @@ UniPhier platform port
 
 Xilinx platform port
 ^^^^^^^^^^^^^^^^^^^^
-:M: Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com>
-:G: `sivadur`_
+:M: Michal Simek <michal.simek@xilinx.com>
+:G: `michalsimek`_
+:M: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@xilinx.com>
+:G: `venkatesh`_
 :F: docs/plat/xilinx-zynqmp.rst
 :F: plat/xilinx/
 
@@ -614,6 +616,7 @@ Build system
 .. _ldts: https://github.com/ldts
 .. _marex: https://github.com/marex
 .. _masahir0y: https://github.com/masahir0y
+.. _michalsimek: https://github.com/michalsimek
 .. _mmind: https://github.com/mmind
 .. _mtk09422: https://github.com/mtk09422
 .. _niej: https://github.com/niej
@@ -624,13 +627,13 @@ Build system
 .. _sandrine-bailleux-arm: https://github.com/sandrine-bailleux-arm
 .. _sgorecha: https://github.com/sgorecha
 .. _shawnguo2: https://github.com/shawnguo2
-.. _sivadur: https://github.com/sivadur
 .. _smaeul: https://github.com/smaeul
 .. _soby-mathew: https://github.com/soby-mathew
 .. _thloh85-intel: https://github.com/thloh85-intel
 .. _thomas-arm: https://github.com/thomas-arm
 .. _TonyXie06: https://github.com/TonyXie06
 .. _vwadekar: https://github.com/vwadekar
+.. _venkatesh: https://github.com/vabbarap
 .. _Yann-lms: https://github.com/Yann-lms
 .. _manish-pandey-arm: https://github.com/manish-pandey-arm
 .. _mardyk01: https://github.com/mardyk01