m7-common: remove extraneous proprietary files

Change-Id: I78bd71f3ffa446a0736995f5acac0f91202691d1
m7: use bluez

  <project name="htc-msm8960/android_external_bluetooth_bluez" path="external/bluetooth/bluez" remote="github" />
  <project name="htc-msm8960/android_external_bluetooth_glib" path="external/bluetooth/glib" remote="github" />

Change-Id: Ifc25c9e37e6ff3f8c6444ba7ecb3a7ef002247f7