Move version definition to its own file

 * Move the ArmNN version to a separate ArmnnVersion.txt file
 * Updated makefiles accordingly

!referencetests:206978
!android-nn-driver:2110

Signed-off-by: Guillaume Gardet <guillaume.gardet@arm.com>
Signed-off-by: Matteo Martincigh <matteo.martincigh@arm.com>
Change-Id: Ib1a34d38b5f4c7490108ea91d930cf5417d1ca94
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 499f721..e1af11e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,6 +7,7 @@
 
 set(additional_cmake_files)
 list(APPEND additional_cmake_files
+    cmake/ArmnnVersion.cmake
     cmake/Utils.cmake
     cmake/GlobalConfig.cmake
     cmake/AddDllCopyCommands.cmake)