libsnapshot: Add seq op support to inspect_cow

This adds the -m option to inspect_cow, allowing it to display the ops
according to CowRevMergeOpItr

Bug: 177104308
Test: inspect_cow -m on file with and without seq ops
Change-Id: Ic9a062b8175c77084e76c437414c23fd09e34cc6
1 file changed