msm: qcn: Add QCN bridge client driver

Add QCN bridge client driver to provide interface to QCN SDIO
core function-1 driver. This driver currently provides interfacing
for diag, IPC router and sahara application.

Change-Id: Ie992aec91347bb68e46a01ee6f67a1d07ce40ecc
Signed-off-by: Amandeep Singh <amansing@codeaurora.org>