add mac result pointer to the callback routine

add mac result pointer to the callback routine
register as supporting MD5_HMAC96 and SHA1_HMAC96
use the correct bit (HIFN_MAC_CMD_NEW_KEY) when checking the mac_cmd mask
don't append the mac result to the dest buffer, add it to the result buffer
remove incorrect source count calculation involving mac length
add order checking to hifn_process so that we can verify the request is
	possible given the ordering of processing units within the hifn.
correct hifn_callback()'s handling of mac checking and copy the computed
	mac into the right place in the mbuf.