Fixes armcc builds in all.sh

MBEDTLS_NV_SEED needs to be disabled in builds without filesystem IO.
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 5031d2a..5262397 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -323,6 +323,7 @@
 scripts/config.pl unset MBEDTLS_NET_C
 scripts/config.pl unset MBEDTLS_TIMING_C
 scripts/config.pl unset MBEDTLS_FS_IO
+scripts/config.pl unset MBEDTLS_ENTROPY_NV_SEED
 scripts/config.pl unset MBEDTLS_HAVE_TIME
 scripts/config.pl unset MBEDTLS_HAVE_TIME_DATE
 scripts/config.pl set MBEDTLS_NO_PLATFORM_ENTROPY