usb: gadget: android: Add snapshot of changes

Add snapshot of changes to android.c from msm-3.14. Some of
these changes also touch gadget.h, composite.c and udc-core.c
necessarily due to subsystem coupling.

The is a squash of the following commits:

usb: gadget: allow android gadget to bind/unbind several times
USB: android: strim serial number buffer
USB: android: Avoid typecasting sysfs buffer
usb: gadget: Vote for SWFI when USB cable is connected
USB: android: Fix missing USB DISCONNECT uevent
USB: android: Provide sysfs file for enabling remote wakeup capability
usb: gadget: android: Honor CONFIG_USB_GADGET_VBUS_DRAW
USB: Trival cleanup in MSM drivers
usb: gadget: android: set max speed to Super Speed
usb: gadget: android: Set usb_core_id if exists
usb: gadget: Allow PID and serial_num update on DT-targets
usb: gadget: Add support for multiple android gadgets
usb: gadget: Add support for more than one configuration in android gadget
usb: android: Add support for voting against APPS idle standalone PC
usb: gadget: Handle function control requests before set config
usb: gadget: Allow function drivers to exist in multiple configurations
usb: gadget: android gadget vote for pm_qos also on suspend/resume
usb: gadget: android: Defer probe if UDC not found
USB: android: Add delay before enabling audio source function
USB: android: Rate limit android enable warning
USB: android: Handle error conditions if usb_add_config fails
USB: android: Prevent change of host mac address of 'rndis0' interface
usb/gadget: android: Handle NULL pointer dereference in android_probe()
usb: gadget: Match gadget and gadget_driver according to usb_core_id
USB: gadget: Add support to enable streaming mode with required function
USB: android: Add support to get usb-core-id using devicetree
usb_bam: changes for HSIC IPA functionality
usb: gadget: change the minor number for android functions
USB: ANDROID: Implement dynamic pm_qos voting based on USB activity

Signed-off-by: Jack Pham <jackp@codeaurora.org>