xtest: remove security_utils_mem.[ch]

Reviewed-by: Joakim Bech <joakim.bech@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
diff --git a/host/xtest/Makefile b/host/xtest/Makefile
index 0607210..81421e5 100644
--- a/host/xtest/Makefile
+++ b/host/xtest/Makefile
@@ -45,8 +45,7 @@
 	adbg/src/adbg_log.c \
 	adbg/src/adbg_run.c \
 	adbg/src/adbg_util.c \
-	adbg/src/security_utils_hex.c \
-	adbg/src/security_utils_mem.c
+	adbg/src/security_utils_hex.c
 
 ifdef CFG_GP_PACKAGE_PATH
 CFLAGS += -DWITH_GP_TESTS