Enable USB poll_sync for Bluetooth USB devices by default

configname: CONFIG_BT_HCIBTUSB_POLL_SYNC

Linux Kernel Configuration
└─>Networking support
└─>Bluetooth subsystem support
└─>Bluetooth device drivers
└─>Enable USB poll_sync for Bluetooth USB devices by default
In linux kernel since version 6.2 (release Date: 2023-02-19)  
poll_sync synchronizes the USB data and event endpoints by
prioritizing the later.

Say Y here to enable USB poll_sync for Bluetooth USB devices by
default.