Bluetooth: btrtl: Create separate module for Realtek BT driver

As already done for btintel and btbcm export setup as separate function
in a vendor-specific module to hold all the Realtek specific commands.

Signed-off-by: Carlo Caione <carlo@endlessm.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/drivers/bluetooth/Makefile b/drivers/bluetooth/Makefile
index dd0d9c4..f40e194 100644
--- a/drivers/bluetooth/Makefile
+++ b/drivers/bluetooth/Makefile
@@ -21,6 +21,7 @@
 obj-$(CONFIG_BT_MRVL_SDIO)	+= btmrvl_sdio.o
 obj-$(CONFIG_BT_WILINK)		+= btwilink.o
 obj-$(CONFIG_BT_BCM)		+= btbcm.o
+obj-$(CONFIG_BT_RTL)		+= btrtl.o
 
 btmrvl-y			:= btmrvl_main.o
 btmrvl-$(CONFIG_DEBUG_FS)	+= btmrvl_debugfs.o