s4-common: use bluetooth.hciattach property and updated bt.sh

PatchSet 1: initial commit
PatchSet 2: re-add license
PatchSet 3: add to common-proprietary-files.txt

Change-Id: I565b2db94887854df1704b2f8c47236283241a19
s4-common: set OpenGL ES version to 2.0

* According to Qualcomm, Adreno 225 supports up to OpenGL ES 2.0 only

Change-Id: I022d956659db1bffaac47740d9ff13d62b8aff3a
s4-common: remove old camera flags

Change-Id: Id2ee45b2e22bc1be9de1e17672b1e0f8c10b4470