smb5-lib: add support of DP/DM pulsing for QC2.0 adapter

This change will enable userspace to control adapter's output
voltage. Userspace can force adapter's output voltage to
5V/9V/12V.

Change-Id: Ib3085c597b70321d44c93f550a8e67173a530514
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>