hammerhead: change to izatcloud xtra servers
hammerhead: change to izatcloud xtra servers

The gpsonextra servers are no longer being used on newer nexus devices and
the data files can only be served over http without ssl, so let's change
to the izatcloud servers in support of CVE-2016-5341.

Change-Id: I8751ad8c4edd04d94603f8a655ff287912d7cfeb

maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead