NativeCrypto: simplify references to EVP_MD_CTX am: 2ef5ac0a7c
NativeCrypto: simplify references to EVP_MD_CTX
am: 2ef5ac0a7c

Change-Id: I0f083be31d5b29e6c5c1cc12b6213a8188071264

google/conscrypt,google/conscrypt,google/conscrypt,google/conscrypt,google/conscrypt,google/conscrypt