msm: qmi: Introduce QMI interface library

This library provides interface functions to the kernel drivers to
perform QMI message marshaling and transport QMI messages over IPC
Router.

Change-Id: I4d919083e2cc208817c24d9f9b4e2ad2df338747
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>