defconfig: enable usbmon module

usbmon or usb monitor will allow I/O tracing on usb bus.

Change-Id: I01031a685f86efeee006dd90f8901ec029a5ca4d
Signed-off-by: Vamsi Krishna <vskrishn@codeaurora.org>
diff --git a/arch/arm/configs/msm8960_defconfig b/arch/arm/configs/msm8960_defconfig
index 262aaac..621e066 100644
--- a/arch/arm/configs/msm8960_defconfig
+++ b/arch/arm/configs/msm8960_defconfig
@@ -373,6 +373,7 @@
 CONFIG_HID_MICROSOFT=y
 CONFIG_USB_ANNOUNCE_NEW_DEVICES=y
 CONFIG_USB_SUSPEND=y
+CONFIG_USB_MON=y
 CONFIG_USB_EHCI_HCD=y
 CONFIG_USB_EHCI_EHSET=y
 CONFIG_USB_EHCI_MSM=y