msm_serial_hs: Cleanup regarding usage of clock enable/disable apis

Currently driver uses clock apis (clock_enable()/clock_disable()) before
accessing any UART Core register. Hence remove all usage of clock apis
which is just increasing the refcount of uart clock instead of turning
on/off the uart lock.

Change-Id: Idf39108e40b23eb7f17d55470247b339a7850a5f
Signed-off-by: Mayank Rana <mrana@codeaurora.org>
usb: Add network bridge host driver for dun and rmnet

This host driver will be used to communicate with modem devices
with dial up network and RMNET interfaces. This driver works as
a bridge to pass control and data packets between the modem and
peripheral usb gadget driver. Driver currently supports
modem devices (vendor ID 0x05c6) with PIDs 0x9001

Change-Id: Id85b552b39d061528a1c3c90a354d73580c9b631
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
Signed-off-by: Jack Pham <jackp@codeaurora.org>
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