libmemtrack: Update parsing of kgsl mem file

The mem file now has additional field, the mapsize. This
represents the size in bytes mapped to userspace. Use this
value and total size of an object to derive the unaccounted
size.

CRs-Fixed: 982589
Change-Id: I9400e7ddacf185ebf93d0dd09e33a61685bea4dd
1 file changed