Platform: Add support for MPS2 AN539 FPGA board

Adds AN539 platform support files. Adds a new target platform to
the build system: "AN539".

Change-Id: I27336502f9526b0e5476d0d594c2d24fb73e72dc
Signed-off-by: Marton Berke <marton.berke@arm.com>
diff --git a/CommonConfig.cmake b/CommonConfig.cmake
index 259136b..4ddd9be 100644
--- a/CommonConfig.cmake
+++ b/CommonConfig.cmake
@@ -117,7 +117,7 @@
 option(TFM_PARTITION_AUDIT_LOG "Enable the TF-M Audit Log partition" ON)
 option(TFM_PARTITION_PLATFORM "Enable the TF-M Platform partition" ON)
 
-if(${TARGET_PLATFORM} STREQUAL "AN521" OR ${TARGET_PLATFORM} STREQUAL "AN519")
+if(${TARGET_PLATFORM} STREQUAL "AN521" OR ${TARGET_PLATFORM} STREQUAL "AN519" OR ${TARGET_PLATFORM} STREQUAL "AN539")
 	set (REFERENCE_PLATFORM ON)
 endif()