Created supplemental_process certificate and private key

Used ~/master/development/tools/make_key with the subject '/C=US/ST=California/L=Mountain View/
O=Android/OU=Android/CN=Android/emailAddress=android@android.com' to create the certificate and key

Bug: 203670791
Test: make, Device boots
Change-Id: Ib0cdf7786c7f74cf294c54187649114e8ec6d315