t0ltecdma: Fix switching incall devices

This fixes switching incall devices with the bt incall fix.
Also drop the speaker boost, its a little loud and remove unused Volume.db

Change-Id: I865dd7146310784491e431fc5b9db89e77092d16
T0ltecdma: fix speaker not working after being on bt

Also fix headset mic volume
Credits for headset fix: https://github.com/Root-Box/device_samsung_t0ltecdma/commit/4ea92cbe2a870a66a68455e1b8984138a50d9fcf

Change-Id: I678769e2bbcf459f8a8ba0bedb4dac90fdb9fc0f