usb: misc: Add snapshot of KS bridge driver

Add snapshot of KS bridge driver from msm-4.4 commit 475c082bb43f
("msm: qcn: Add QCN SDIO core driver directory in Kconfig"). This
driver works as a bridge with connected modem device to pass boot
images, ram-dumps etc. Also fix checkpatch warnings.

Change-Id: I02ae8a5781500b86356a50627ee8424a800e03e8
Signed-off-by: Ajay Agarwal <ajaya@codeaurora.org>