legacy/msm7x30: Remove dead code.

Change-Id: I729508452f317fc3c4a36fd19b72ab9836c7b3d2
legacy/msm7x30: Fix stereo recording on SEMC devices

* Finally, after 3 years. Thanks to miniuser123@xda for pointing the correct devices

Change-Id: I1f4d59004a7d56aab62860b5c77e3bd8e95a677c