USB: OTG: Take wakelock when VBUS present

Enabled by default, can disable with:
   echo N > /sys/module/otg_wakelock/parameters/enabled

Change-Id: I34974624c52ae23490852b44c270d2f326cf6116
Signed-off-by: Todd Poynor <toddpoynor@google.com>
diff --git a/drivers/usb/otg/Makefile b/drivers/usb/otg/Makefile
index 566655c..c428207 100644
--- a/drivers/usb/otg/Makefile
+++ b/drivers/usb/otg/Makefile
@@ -7,6 +7,7 @@
 
 # infrastructure
 obj-$(CONFIG_USB_OTG_UTILS)	+= otg.o
+obj-$(CONFIG_USB_OTG_WAKELOCK)	+= otg-wakelock.o
 
 # transceiver drivers
 obj-$(CONFIG_USB_GPIO_VBUS)	+= gpio_vbus.o