driver: bluetooth: hci: Support NXP BT CTLR FW blobs

Add Kconfig.nxp to support NXP Bluetooth Chipset.
Current only NXP IW612 Chipset (BT_NXP_NW612) has
been supported.

Add modules/hal_nxp/bt_controller/CMakeLists.txt to
determine whether any firmware is selected, and
check whether the firmware exists.

If the firmware exists, copy the firmware to the
temporary folder ${ZEPHYR_BINARY_DIR}/include/
generated/bt_nxp_ctlr_fw.h. OR, raise a fatal error.

In file hci_nxp_setup.c, includes the temporary file
bt_nxp_ctlr_fw.h.

Signed-off-by: Lyle Zhu <lyle.zhu@nxp.com>

drivers/bluetooth/hci/Kconfig

@@ -250,29 +250,14 @@ config BT_SILABS_HCI_BUFFER_MEMORY
 	  Bluetooth Library.
 
 config BT_H4_NXP_CTLR
-	bool "NXP Bluetooth Controller [EXPERIMENTAL]"
+	bool "NXP Bluetooth Controller"
 	select GPIO
-	# select UART_USE_RUNTIME_CONFIGURE
-	select EXPERIMENTAL
 	depends on BT_H4
 	select CRC
 	default y
 	depends on DT_HAS_NXP_BT_HCI_UART_ENABLED
 	help
 	  Enables support for NXP Bluetooth Controller.
-	  Murata 2EL M.2 Moudle base on NXP IW612 Chipset which supports
-	  Wi-Fi® 802.11a/b/g/n/ac/ax + Bluetooth® 5.3 BR/EDR/LE + IEEE802.1.5.4
-	  up to 601 Mbps data rate on Wi-Fi® and 2Mbps data rate on Bluetooth®.
-	  4-wire UART@3M baud is supported. PCM for audio is also supported.
-	  Details of the module could be fond on
-	  https://www.embeddedartists.com/products/2el-m-2-module/
-
-	  The configuration depends on the firmware (named uart_nw61x_se.h)
-	  of Murata 2EL M.2 Moudle. It could be downloaded here
-	  https://github.com/NXP/wifi_nxp/blob/MCUX_2.15.000/wifi_bt_firmware/nw61x/uart_nw61x_se.h
-	  And it needs to be placed into the folder <zephyrproject>/zephyr/
-	  drivers/bluetooth/hci.
-
 	  More inforamtion about NXP Bluetooth profuct could be found on
 	  https://www.nxp.com/products/wireless-connectivity/wi-fi-plus-bluetooth-plus-802-15-4:WIFI-BLUETOOTH