usb: Add support diag host driver

USB diag host driver will be used to connect diag interface
exposed by Qualcomm devices. This driver currently supports
usb qualcomm devices with product id: 9001 and vendor id:
0x5c6. Also add simple unit test driver to test diag host
driver.

Signed-off-by: Vamsi Krishna <vskrishn@codeaurora.org>
Signed-off-by: Jack Pham <jackp@codeaurora.org>
diff --git a/drivers/usb/misc/Makefile b/drivers/usb/misc/Makefile
index c8e777a..20ee62a 100644
--- a/drivers/usb/misc/Makefile
+++ b/drivers/usb/misc/Makefile
@@ -28,3 +28,6 @@
 obj-$(CONFIG_USB_YUREX)			+= yurex.o
 
 obj-$(CONFIG_USB_SISUSBVGA)		+= sisusbvga/
+
+obj-$(CONFIG_USB_QCOM_DIAG)		+= diag_usb.o
+obj-$(CONFIG_USB_QCOM_DIAG_TEST)	+= diag_bridge_test.o