cipher_hmac_sha256{_hw.c, .c, .h}: add initial file for sha256 cipher #1162

Job	Run time
run-checker (no-cmp)	45s
run-checker (no-cms)	47s
run-checker (no-dgram)	59s
run-checker (no-dh)	49s
run-checker (no-dtls)	56s
run-checker (no-ec)	50s
run-checker (no-ecx)	47s
run-checker (no-http)	55s
run-checker (no-legacy)	47s
run-checker (no-sock)	50s
run-checker (enable-ssl-trace)	47s
run-checker (no-stdio)	48s
run-checker (no-threads)	52s
run-checker (no-thread-pool)	52s
run-checker (no-default-thread-pool)	49s
run-checker (no-tls)	47s
run-checker (no-tls1_2)	54s
run-checker (no-tls1_3)	52s
run-checker (enable-trace enable-fips)	47s
run-checker (no-ui)	50s
run-checker (no-quic)	50s
	17m 33s

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