arm64: defconfig: Enable bluetooth USB support

Enable the Bluetooth USB controller which is present
in the RK3399 Kevin Chromebook.
Signed-off-by: NEzequiel Garcia <ezequiel@collabora.com>
Signed-off-by: NHeiko Stuebner <heiko@sntech.de>

arch/arm64/configs/defconfig

@@ -157,6 +157,7 @@ CONFIG_BT_HIDP=m
 # CONFIG_BT_LE is not set
 CONFIG_BT_LEDS=y
 # CONFIG_BT_DEBUGFS is not set
+CONFIG_BT_HCIBTUSB=m
 CONFIG_BT_HCIUART=m
 CONFIG_BT_HCIUART_LL=y
 CONFIG_CFG80211=m