audio: update AudioExt to 3.0

Bug: 206065000
Test: build pass
Signed-off-by: Carter Hsu <carterhsu@google.com>
Change-Id: Ica399a4bd1ff9e97be514455dcebdb05939d1537

manifest.xml

@@ -143,7 +143,7 @@
     <hal format="hidl">
        <name>vendor.google.whitechapel.audio.audioext</name>
        <transport>hwbinder</transport>
-       <version>2.0</version>
+       <version>3.0</version>
        <interface>
            <name>IAudioExt</name>
            <instance>default</instance>