usb: gadget: Add snapshot of changes to u_ether

Add snapshot of changes to u_ether.c and u_ether.h from msm-3.14
made between commit 455c6fdb (Linux 3.14) and commit 3bc54cf86b
(Merge "msm: camera: Add dummy sub module in sensor pipeline")

This is a squash of the following commits:

USB: u_ether: Configure the endpoints before enabling them in eth_stop()
usb: gadget: u_ether: Remove warning from gether_disconnect()
USB: gadget: u_ether: Fix data stall issue in RNDIS tethering mode
RNDIS: Add Data aggregation (multi packet) support
usb: u_ether: Add workqueue as bottom half handler for rx data path
Rndis: Add debug support to disable RNDIS Multipacket Feature
usb: Add support for rndis uplink aggregation
usb: rndis: reset ul aggregation stats for every set_alt
USB: gadget: rndis: Add module parameter for DL max packets per xfer
USB: u_ether: Check if driver_data and port_usb is NULL before accessing
usb: gadget: u_ether: Fix NULL pointer dereference crash
u_ether: Handle memory allocation failure case on tx path
usb: gadget: u_ether: Fix memory corruption in TX path
usb: gadget: u_ether: Add IOCTLs to allow MODE and HEADROOM changes
usb: gadget: u_ether: Don't drop IP packets with size > ETH_FRAME
u_ether: Add tx_throttle count for rndis performance statistic
USB: gadget: rndis: Optimize tx path for better performance
USB: gadget: ether: Clean up req->buf to avoid wild pointer
usb: gadget: u_ether: Add ETH_P_MAP skb protocol type
usb: gadget: u_ether: Add RMNET extended IOCTLs
USB: gadget: ether: Fix memory corruption issues with multi_pkt_xfers
USB: gadget: Compilation fixes for 64-bit support
usb: gadget: u_ether: set_wake_up_idle in rx path
usb: gadget: u_ether: reorganize code for better readability
usb: gadget: u_ether: add scatter/gather support
u_ether: Boost the cpu when rmnet/rndis ifc is up
USB: u_ether: Fix race between gether_disconnect and rx_submit
usb: gadget: u_ether: Fix incorrect S/G free in tx_complete
usb: gadget: u_ether: add tx multipler module param
usb: gadget: u_ether: Add module param to config cpu boost freq
usb: gadget: ether: Add counters for tx packets
USB: u_ether: Submit requests from rx_complete until limit reached
usb: gadget: u_ether: Fix NULL pointer dereference in process_tx_w()
usb: gadget: u_ether: Fix Out-of-order packets in UL bi-dir in RNDIS mode
usb: gadget: u_ether: Check if cable is connected before get and set MRU
usb: gadget: Disable scatter/gather for NCM
usb: gadget: u_ether: Fix missing parameter for DBG logs
USB: gadget: u_ether: unalign IP header to make DMA aligned
usb: gadget: u_ether: Fix updating of tx_bytes in network stats
usb: gadget: u_ether: Count number of bytes received at USB layer

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