mkuserimg_mke2fs: Add -I <inode-size> flag

Caller should be able to add stability to the inode-size based on
system requirements.  For example we may wish to select an inode-size
that will absorb all the xattr inline.

Test: manual
Bug: 122328872
Change-Id: I07ce400b6482646f9b5b353a00f592410aad13b7
1 file changed