Add audio_policy, del llvm-select.mk, ...

Change-Id: I6377cf0c30792386a7eb735e73060e079732edba

In device.mk:
    - Change in the form of call gps.conf.
    - Simplified kernel prebuilt integration.
    - Imported "audio_policy.conf" from lg p930
    - Delete the duplicate # misc PRODUCT_PROPERTY_OVERRIDES.

In qcom-common.mk:
    - Only includes "PRODUCT_PACKAGES", the rest of code is moves to device.mk
    - Restructuring PRODUCT_PACKAGES, removing unnecessary lines, example: 
        (PRODUCT_PACKAGES += \
        libangle
        to
        PRODUCT_PACKAGES += libangle)
    - Deleted file "llvm-select.mk" and code to included it.
    - Commented the line #PRODUCT_PACKAGES += libQcomUI now is libqdutils. Sorry, I forgot to remove the line in "proprietary-files.txt"

In setup-makefiles.sh
    - Delete obj/lib/libqc-opt.so, not necessary yet. Affect the repository vendor, if approved the change, automatically switch there.