fix path to sounds in sdk product

This is necessary to build the SDK:

    lunch sdk-eng && make sdk

Change-Id: I7b9dcfc418ddc46e2967b627525d042bbf6334e1
envsetup: export ANDROID_BUILD_TOP earlier

Change-Id: Ia3497f61f4e9aaeeb793cecd3b4f488f0a48181a
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