uwb: add the i1480 DFU driver

Add the driver for downloading the firmware to an Intel i1480 device.

Signed-off-by: David Vrabel <david.vrabel@csr.com>
diff --git a/drivers/uwb/i1480/Makefile b/drivers/uwb/i1480/Makefile
new file mode 100644
index 0000000..d69da16
--- /dev/null
+++ b/drivers/uwb/i1480/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_UWB_I1480U)	+= dfu/ i1480-est.o