Bluetooth: btrsi: add new rsi bluetooth driver

Redpine bluetooth driver is a thin driver which depends on
'rsi_91x' driver for transmitting and receiving packets
to/from device. It creates hci interface when attach() is
called from 'rsi_91x' module.

Signed-off-by: Prameela Rani Garnepudi <prameela.j04cs@gmail.com>
Signed-off-by: Siva Rebbagondla <siva.rebbagondla@redpinesignals.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Reviewed-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Amitkumar Karwar <amit.karwar@redpinesignals.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/bluetooth/Kconfig

@@ -392,4 +392,16 @@ config BT_QCOMSMD
 	  Say Y here to compile support for HCI over Qualcomm SMD into the
 	  kernel or say M to compile as a module.
 
+config BT_HCIRSI
+	tristate "Redpine HCI support"
+	default n
+	select RSI_COEX
+	help
+	  Redpine BT driver.
+	  This driver handles BT traffic from upper layers and pass
+	  to the RSI_91x coex module for further scheduling to device
+
+	  Say Y here to compile support for HCI over Redpine into the
+	  kernel or say M to compile as a module.
+
 endmenu