cmake: Rename mbedcrypto target to tfpsacrypto

Rename mbedcrypto target to tfpsacrypto and
prefix all cmake related variables with
tfpsacrypto instead of mbedcrypto.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/programs/util/CMakeLists.txt b/programs/util/CMakeLists.txt
index ac713dc..a535402 100644
--- a/programs/util/CMakeLists.txt
+++ b/programs/util/CMakeLists.txt
@@ -1,5 +1,5 @@
 set(libs
-    ${mbedcrypto_target}
+    ${tfpsacrypto_target}
     ${mbedx509_target}
 )