Remove `MBEDTLS_SHA3_C` config option

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
diff --git a/programs/test/selftest.c b/programs/test/selftest.c
index 5157573..8516f3a 100644
--- a/programs/test/selftest.c
+++ b/programs/test/selftest.c
@@ -290,7 +290,10 @@
 #if defined(MBEDTLS_SHA512_C)
     { "sha512", mbedtls_sha512_self_test },
 #endif
-#if defined(MBEDTLS_SHA3_C)
+#if defined(PSA_WANT_ALG_SHA3_224) || \
+    defined(PSA_WANT_ALG_SHA3_256) || \
+    defined(PSA_WANT_ALG_SHA3_384) || \
+    defined(PSA_WANT_ALG_SHA3_512)
     { "sha3", mbedtls_sha3_self_test },
 #endif
 #if defined(MBEDTLS_DES_C)