msm: hsic_sysmon: Add system monitor HSIC bridge

This driver is used to communicate with the system monitor
interface of an external modem device connected via HSIC. A simple
API consisting of open/close/read/write functions is provided to
send and receive data to and from a remote system monitor.

CRs-fixed: 349727
Change-Id: I84a81ec1cdb3dae705200907f8805da70afe58ee
Signed-off-by: Jack Pham <jackp@codeaurora.org>