msm: smd: migrate 8974 support in smd to device tree

Migrate the SMD support for the 8974 target away from the legacy
platform data mechanism to the new device tree mechanism.

Change-Id: I786b2a8e8b0125fc0a28f2d6a76cdea8b26a8488
Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org>