current.txt: remove libadf since it is no longer supported

Libadf is being removed since there are no android common kernels
that support adf. Remove support from miniui.

Test: Compiles and boots
Bug: 150467766
Change-Id: I67b52c62aaaba0da9a0cbb762f0947a4ea8e1b89
Merged-In: I67b52c62aaaba0da9a0cbb762f0947a4ea8e1b89