Sound Control: fix applying wrong values on boot

When rebooting, DSP Manager restores the RAW values instead of the
ones, with the offsets applied.
This causes the values to be terrible high.

We prevent this issue with applying the offset when writing the
value instead of applying it when saving the value as preference.

Change-Id: Ib935a041cde0a3fdd0280f1fa41ffd13eac8fee4

Conflicts:

	res/values/arrays.xml
sc: Fix Speaker derp

We applied the wrong value to the speaker in preferences as
we called the wrong method to read the speakers value.

fix the method call, get rid of our troubles.

Change-Id: Id52fc8397a1eb4198ae2271bf88693e15b816369