evita: Cleanup unused files

1) AudioBTID.csv: only used by msm8660 qcom audio-caf, not msm8960
2) Keylayouts: removed those provided by AOSP in frameworks/base/data/keyboards

Change-Id: Ic77ebcde6931e2abc9a5861d9fe1e859bcc2bc39
Signed-off-by: Rohan Mathur <rohanmathur34@gmail.com>