chore(config): correct build config MBEDTLS_ECP_MAX_OPS name

This patch corrects the build config MBEDTLS_ECP_MAX_OPS name.

Signed-off-by: Shruti Gupta <shruti.gupta@arm.com>
Change-Id: Ie6c17da5ceb24a92da5a2f66a2346d88a09ab53d
diff --git a/lib/attestation/src/attestation_utils.c b/lib/attestation/src/attestation_utils.c
index c985f74..02cc19c 100644
--- a/lib/attestation/src/attestation_utils.c
+++ b/lib/attestation/src/attestation_utils.c
@@ -61,7 +61,7 @@
 	 *
 	 * This adjusts the length of a single signing loop.
 	 */
-	FPU_ALLOW(mbedtls_ecp_set_max_ops(ECP_MAX_OPS));
+	FPU_ALLOW(mbedtls_ecp_set_max_ops(MBEDTLS_ECP_MAX_OPS));
 
 	FPU_ALLOW(ret = attest_rnd_prng_init());
 	if (ret != 0) {