wcnss: Add wcnss snapshot to msm-4.19

Add pronto platform driver support in kernel msm-4.19.
This is a snapshot of the wcnss driver and associated files
as of msm-4.14.

Change-Id: I9156c4e03ba4e758face536275395ca0d2ca04fc
Signed-off-by: Sandeep Singh <sandsing@codeaurora.org>