Tweak the CAM_DATA flags that were added with r251874 to allow source
compatibility and almost 100% binary compatibility.  The old
CAM_SG_LIST_PHYS flag is essentially lost in binary compatibility for
legacy SIM drivers.  The use of this flag is excedingly rare.

Obtained from:	Netflix
Poor man's binary compatibility of the struct bio: move the added structure
members to the end of the structure.

Obtained from:	Netflix
MFC r251989:

Fix an unfortunate typo with the compat shims

Obtained from:	Netflix