README: support for NXP IMX8

Signed-off-by: Peng Fang <peng.fan@nxp.com>
Signed-off-by: Claudio Scordino <claudio@evidence.eu.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

README.md

@@ -130,6 +130,8 @@ Hardware requirements (preliminary)
 
     - Xilinx ZCU102 (ZynqMP evaluation board)
 
+    - NXP MCIMX8M-EVK
+
 
 Software requirements
 ---------------------