crypto: msm: fix authdata copy issue in qcedev_sha_req_cb

qcedev_sha_req_cb() is only called by _sha_complete() during sha
operation, and will copy byte_count value from authdata array.
This array size is two, and only contains two byte_count value
that are used for sha operation. So make change to only copy the
first two elements from this array.

Change-Id: I535f2ec0e358870a9a2163b3c0bf154b2c8d003f
Signed-off-by: Zhen Kong <zkong@codeaurora.org>