mbedtls: add pkcs7 test data

This commit adds the static test data generated by
commands from Makefile.

Signed-off-by: Nayna Jain <nayna@linux.ibm.com>
diff --git a/tests/data_files/pkcs7-rsa-sha256-2.crt b/tests/data_files/pkcs7-rsa-sha256-2.crt
new file mode 100644
index 0000000..0cd377a
--- /dev/null
+++ b/tests/data_files/pkcs7-rsa-sha256-2.crt
@@ -0,0 +1,20 @@
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