audio_kernel: convert Android.mk to Android.bp audio_kernel_headers

gensrcs {

    name: "qcom-audio-kernel-includes",

    cmd: "$(location headers_install.sh) `dirname $(out)` `dirname $(in)` `basename $(in)`",

    tools: ["headers_install.sh"],

    export_include_dirs: ["include/uapi"],

    srcs: [

        "include/uapi/**/*.h",

    ],

    output_extension: "h",

}

cc_library_headers {

    name: "qcom_audio_kernel_headers",

    generated_headers: ["qcom-audio-kernel-includes"],

    export_generated_headers: ["qcom-audio-kernel-includes"],

    vendor: true,

    recovery_available: true,

}