audio flinger: rename Bluetooth latency mode APIs

Rename APIs controlling Bluetooth variable latency
after API review suggestions.

Bug: 257922898
Test: make
Change-Id: I517ad9c6aef14975c9e0a1a2703d1b17d638ea0e
diff --git a/services/audioflinger/AudioHwDevice.h b/services/audioflinger/AudioHwDevice.h
index 0e840a6..1749f3f 100644
--- a/services/audioflinger/AudioHwDevice.h
+++ b/services/audioflinger/AudioHwDevice.h
@@ -66,7 +66,7 @@
         return (0 != (mFlags & AHWD_IS_INSERT));
     }
 
-    bool supportsBluetoothLatencyModes() const {
+    bool supportsBluetoothVariableLatency() const {
         return (0 != (mFlags & AHWD_SUPPORTS_BT_LATENCY_MODES));
     }