A2DP enable AAC-VBR by default

AAC-VBR is more prefered than AAC-CBR for A2DP playback.

Bug: 200101304
Bug: 229939538
Test: dumpsys bluetooth_manager
Change-Id: I8930fdf383a4bbe481371b4aa4379f554bb9bd15

device-cheetah.mk

@@ -251,3 +251,7 @@ PRODUCT_VENDOR_PROPERTIES += \
 # Vibrator HAL
 PRODUCT_VENDOR_PROPERTIES += \
     ro.vendor.vibrator.hal.chirp.enabled=1
+
+# Bluetooth AAC VBR
+PRODUCT_PRODUCT_PROPERTIES += \
+    persist.bluetooth.a2dp_aac.vbr_supported=true

device-panther.mk

@@ -243,3 +243,7 @@ PRODUCT_VENDOR_PROPERTIES += \
 # Vibrator HAL
 PRODUCT_VENDOR_PROPERTIES += \
     ro.vendor.vibrator.hal.chirp.enabled=1
+
+# Bluetooth AAC VBR
+PRODUCT_PRODUCT_PROPERTIES += \
+    persist.bluetooth.a2dp_aac.vbr_supported=true