iw: fix references to libnl in Android.mk

The latest AOSP refers to that library as libnl and not libnl_2.

TEST=Built AOSP tree with this patchset, tested the generated iw binary.

Change-Id: I79ba4249e3f43bb6d593915458f9a06002d200d2
Signed-off-by: Filipe Brandenburger <filbranden@google.com>
1 file changed