sensors: Use stock's configuration

... where the heck did I get this value in the first place? :/

Change-Id: I4b9e60924d068fe29044ec955fb072f4a51169d5
Drop local copies of ION headers

All projects now fetch this reliably from the actual kernel source tree

Change-Id: Ib044239bcea6e84759e05d75f718583dbf6e0839