f2fs-tools: Cleanup build targets
f2fs-tools: Cleanup build targets

* Remove host targets, they are provided by system/extras/f2fs_utils

Change-Id: Ib66405df0411dbd481b3bd220f9854648c8f1339

NamelessRom/android_external_f2fs-tools,NamelessRom/android_external_f2fs-tools,PAC-ROM/android_external_f2fs-tools,blastagator/cm_external_f2fs-tools,blastagator/cm_external_f2fs-tools,PAC-ROM/android_external_f2fs-tools