TinyCrypt Test: Force use of Secp256r1 CRTs and Keys in all.sh test

This commit uses the flexibility of being able to chose CRTs and keys
to be used by compat.sh through predefined environment variables to
force the use of Secp256r1 certificates and keys in the all.sh test
for TinyCrypt.
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 7bb02c8..dc4c4a9 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -1418,6 +1418,12 @@
     msg "test: default config with tinycrypt enabled and legacy ECC disabled"
     make test
     if_build_succeeded tests/ssl-opt.sh -f "^Default, DTLS$"
+
+    export SRV_ECDSA_CRT=data_files/server11.crt.pem
+    export SRV_ECDSA_KEY=data_files/server11.key.pem
+    export CLI_ECDSA_CRT=data_files/cli3.crt.pem
+    export CLI_ECDSA_KEY=data_files/cli3.key.pem
+    export CA_FILE=data_files/test-ca3.crt.pem
     if_build_succeeded tests/compat.sh -m 'dtls1_2' -f 'TLS-ECDHE-ECDSA-WITH-AES-256-CBC-SHA\|+ECDHE-ECDSA:+AES-256-CBC:+SHA1\|ECDHE-ECDSA-AES256-SHA' -e 'SHA384'
 }