Add test for ecdsa_read_signature_restartable()

Test values taken from a random signature as generated in
ecdsa_write_read_random() test function
diff --git a/tests/suites/test_suite_ecdsa.data b/tests/suites/test_suite_ecdsa.data
index c0fab76..6ca912a 100644
--- a/tests/suites/test_suite_ecdsa.data
+++ b/tests/suites/test_suite_ecdsa.data
@@ -250,3 +250,6 @@
 depends_on:MBEDTLS_ECP_DP_SECP521R1_ENABLED:MBEDTLS_SHA512_C
 ecdsa_det_test_vectors:MBEDTLS_ECP_DP_SECP521R1:"0FAD06DAA62BA3B25D2FB40133DA757205DE67F5BB0018FEE8C86E1B68C7E75CAA896EB32F1F47C70855836A6D16FCC1466F6D8FBEC67DB89EC0C08B0E996B83538":MBEDTLS_MD_SHA512:"test":"13E99020ABF5CEE7525D16B69B229652AB6BDF2AFFCAEF38773B4B7D08725F10CDB93482FDCC54EDCEE91ECA4166B2A7C6265EF0CE2BD7051B7CEF945BABD47EE6D":"1FBD0013C674AA79CB39849527916CE301C66EA7CE8B80682786AD60F98F7E78A19CA69EFF5C57400E3B3A0AD66CE0978214D13BAF4E9AC60752F7B155E2DE4DCE3"
 
+ECDSA restartable read-verify: restart disabled
+depends_on:MBEDTLS_ECP_DP_SECP256R1_ENABLED
+ecdsa_read_restart:MBEDTLS_ECP_DP_SECP256R1:"04e8f573412a810c5f81ecd2d251bb94387e72f28af70dced90ebe75725c97a6428231069c2b1ef78509a22c59044319f6ed3cb750dfe64c2a282b35967a458ad6":"dee9d4d8b0e40a034602d6e638197998060f6e9f353ae1d10c94cd56476d3c92":"304502210098a5a1392abe29e4b0a4da3fefe9af0f8c32e5b839ab52ba6a05da9c3b7edd0f0220596f0e195ae1e58c1e53e9e7f0f030b274348a8c11232101778d89c4943f5ad2":0:0:0