Maintainers: update project maintainers

Add Arnaud and Ed as project maintainers
Add Ed as Xilinx platform maintainer

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>

Author: arnopo

MAINTAINERS.md

@@ -9,13 +9,17 @@ names to be CC'd when submitting a patch.
 
 ## Project Administration
 Wendy Liang <wendy.liang@xilinx.com>
+Ed Mooring <ed.mooring@linaro.org>
+Arnaud Pouliquen <arnaud.pouliquen@st.com>
 
 ### All patches CC here
 open-amp@googlegroups.com
 
 ## Machines
 ### Xilinx Platform - Zynq-7000
 Wendy Liang <wendy.liang@xilinx.com>
+Ed Mooring <ed.mooring@linaro.org>
 
 ### Xilinx Platform - Zynq UltraScale+ MPSoC
 Wendy Liang <wendy.liang@xilinx.com>
+Ed Mooring <ed.mooring@linaro.org>