regression 4016: drop _ed25519 suffix

Removes the unnecessary suffix _ed25519 for the regression test case
4016.

Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
diff --git a/host/xtest/regression_4000.c b/host/xtest/regression_4000.c
index ade6753..542f569 100644
--- a/host/xtest/regression_4000.c
+++ b/host/xtest/regression_4000.c
@@ -5983,7 +5983,7 @@
 out:
 	TEEC_CloseSession(&session);
 }
-ADBG_CASE_DEFINE(regression, 4016_ed25519, xtest_tee_test_4016_ed25519,
+ADBG_CASE_DEFINE(regression, 4016, xtest_tee_test_4016_ed25519,
 		 "Test TEE Internal API ED25519 sign/verify");
 
 #endif /*CFG_SYSTEM_PTA*/