IVGCVSW-3656 Rename ARMCOMPUTEREF to ARMNNREF

 * Renamed ARMCOMPUTEREF to ARMNNREF (and relative symbols) as the
   previous name was misleading

!android-nn-driver:1819

Change-Id: I912e9f521750b91539e48f8a2fb4de73fb6f7425
Signed-off-by: Matteo Martincigh <matteo.martincigh@arm.com>
diff --git a/src/backends/reference/backend.cmake b/src/backends/reference/backend.cmake
index e88968d..01a4ee1 100644
--- a/src/backends/reference/backend.cmake
+++ b/src/backends/reference/backend.cmake
@@ -6,7 +6,7 @@
 add_subdirectory(${PROJECT_SOURCE_DIR}/src/backends/reference)
 list(APPEND armnnLibraries armnnRefBackend)
 
-if(ARMCOMPUTEREF)
+if(ARMNNREF)
     list(APPEND armnnLibraries armnnRefBackendWorkloads)
     list(APPEND armnnUnitTestLibraries armnnRefBackendUnitTests)
 else()