Second round of fixes for IIO in the 4.1 cycle.

* twl6030-gpadc - Drop a bonus space from the modalias.
* adis16400 - Report pressure channel scale (not much use without it)
            - Use different channel indices for the two voltage channels (ABI)
	    - Compute the san mask from the channel indices instead of using
	      ~0UL as we now care about extra bits being set.
	    - Fix burst mode due to rx buffer not being intialized and wrong
	      tx buffer type being set.  Also had the wrong transfer length.
	      All in all it didn't work, now it does ;)
	    - adis16448 has additional registers in burst mode so we skip
	      over them to make it work.
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