Simplify test for building P256-M

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index bd6b966..e15fb2a 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -3276,7 +3276,7 @@
     not grep mbedtls_dhm_ library/dhm.o
     not grep mbedtls_mpi_ library/bignum.o
     # Check that p256m was built
-    grep -q p256_ecdsa_verify library/libmbedcrypto.a
+    grep -q p256_ecdsa_ library/libmbedcrypto.a
 
     # Run the tests
     msg "test: TF-M config + p256m driver + accel ECDH(E)/ECDSA"
@@ -3297,7 +3297,7 @@
     make CFLAGS='-Werror -Wall -Wextra -I../tests/include/spe' tests
 
     # Check that p256m was not built
-    not grep p256_ecdsa_verify library/libmbedcrypto.a
+    not grep p256_ecdsa_ library/libmbedcrypto.a
 
     msg "test: TF-M config"
     make test