audio: make VINTF target level specify by device

Bug: 277188108
Change-Id: Ia7f787e68a9a34529d858c78189b5f2bd245377c
diff --git a/audio/hidl/manifest.xml b/audio/hidl/manifest.xml
index 80eec22..a8d4979 100644
--- a/audio/hidl/manifest.xml
+++ b/audio/hidl/manifest.xml
@@ -1,4 +1,4 @@
-<manifest version="1.0" type="device" target-level="7">
+<manifest version="1.0" type="device">
    <hal format="hidl">
         <name>android.hardware.audio</name>
         <transport>hwbinder</transport>