i9082: remove broadcom audio codec blobs

They're software-based, currently not used (due to a bug) and not
needed since Google's version works fine.

Change-Id: I150e2f9a1aea479c7f0a975858d527c50481260b
i9082: fix call MUTE

SET_MUTE needs to be routed through AudioManager

Change-Id: Ib22b71d64ea485ab5e39beda744f4f214dd5a5e3
i9082: display correct serial number

The sticker serial number is stored in ril.serialnumber

Note: the CMHW class has not been accepted into CM at the time of
this commit

Change-Id: I3ddb096ca964c6ad50197334222d144be577987d