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>