platform: nordic_nrf: Fix ITS encryption config

The wrong CMake define for enabling encryption in ITS was used.

Change-Id: I9e3b0e363e6588272167ef84f6ca1769ff7687d5
Signed-off-by: Markus Swarowsky <markus.swarowsky@nordicsemi.no>
diff --git a/platform/ext/target/nordic_nrf/common/core/CMakeLists.txt b/platform/ext/target/nordic_nrf/common/core/CMakeLists.txt
index 73d3066..8023e10 100644
--- a/platform/ext/target/nordic_nrf/common/core/CMakeLists.txt
+++ b/platform/ext/target/nordic_nrf/common/core/CMakeLists.txt
@@ -132,7 +132,7 @@
     PUBLIC
         $<$<BOOL:${TEST_PSA_API}>:PSA_API_TEST_ENABLED>
         $<$<BOOL:${NULL_POINTER_EXCEPTION_DETECTION}>:NULL_POINTER_EXCEPTION_DETECTION>
-        $<$<BOOL:${TFM_ITS_ENCRYPTED}>:TFM_ITS_ENCRYPTED>
+        $<$<BOOL:${ITS_ENCRYPTION}>:ITS_ENCRYPTION>
 )
 
 #========================= Platform Non-Secure ================================#