libsensors: Fix build breakage. Don't build IIO hal unless requested

Avoid building the libinvensense_hal and other libs unless
IIO is requested.

Change-Id: I051c501bd3267e72cc4d66544dbbbbd5418ae680
1 file changed
tree: 92af1654715f9476adbe2bbc0473932707b684a3
  1. libsensors/
  2. Android.mk