slim_msm: effective management of data ports

The current implementaion of data ports management
assumes that the ports are allocated contiguously,
which is not a correct assumption.
This patch addresses this limitation and handles
the data ports which are allocated non-contiguously.

Change-Id: I04e83bc525a50db4d0a37028498be848af018bb5
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Signed-off-by: Sagar Dharia <sdharia@codeaurora.org>