[Bluetooth] Update the Kconfig entry for the BlueFRITZ! USB driver

The BlueFRITZ! USB driver must use "select" to enable the firmware
loader, because the option "enable" is deprecated.

drivers/bluetooth/Kconfig

@@ -57,9 +57,9 @@ config BT_HCIUART_BCSP
 	  Say Y here to compile support for HCI BCSP protocol.
 
 config BT_HCIUART_BCSP_TXCRC
-        bool "Transmit CRC with every BCSP packet"
-        depends on BT_HCIUART_BCSP
-        help
+	bool "Transmit CRC with every BCSP packet"
+	depends on BT_HCIUART_BCSP
+	help
 	  If you say Y here, a 16-bit CRC checksum will be transmitted along with
 	  every BCSP (BlueCore Serial Protocol) packet sent to the Bluetooth chip.
 	  This increases reliability, but slightly reduces efficiency.
@@ -67,7 +67,7 @@ config BT_HCIUART_BCSP_TXCRC
 config BT_HCIBFUSB
 	tristate "HCI BlueFRITZ! USB driver"
 	depends on USB && BT
-	enable FW_LOADER
+	select FW_LOADER
 	help
 	  Bluetooth HCI BlueFRITZ! USB driver.
 	  This driver provides support for Bluetooth USB devices with AVM