d2: audio: Fix routing for BT voicedial feature

MultiMedia1 frontend does not have a route to an "AUX_PCM_TX" sink.
Alternatively, this can be hacked easily in the kernel.

Change-Id: If0b5c0fb9ff43b79523027a372fedc8b40afc23d
Merge pull request #2 from CyanogenMod/cm-10.1

d2: audio: Fix routing for BT voicedial feature