Adds enhanced checksum support to IPA, when os_hash_algo and os_hash_value
are passed in via image_info, it will be used to calculate image checksum
and verification.
In other cases, the old md5 checksum is used.
Change-Id: I1d2f33e7059910326b4ac3f7786543b333a93a5a
Story: 2003938
Task: 26846