Add TW_IGNORE_MT_POSITION_0 touch flag

This fixes touch on the a11 when fastboot booting the image. We
are also adding event logging for ABS_MT_POSITION data which we
should have been logging before but for some reason we did not.

Change-Id: I1b38c31c716efdcbe48db4faa5d0cef97c91c58e
Improve MTPServer logging of read errors

Unless MTP debug logging is enabled, you will miss the error and
will not know that something went wrong in the log.

Change-Id: I51f4758b415eb38e808ec8b1c9788b505bf88c65