use f2fs upstream host to generate image

calls make_f2fs -S <size> <filename>

Test: ./mkf2fsuserimg.sh ~/android/userdata.img 2000000000
Bug: 62493641
Change-Id: I4d3631a631fbdfbfc680eeba5f2a1dde204cba25
Merged-In: I4d3631a631fbdfbfc680eeba5f2a1dde204cba25
2 files changed