slim_msm: Get platform-specific information from platform-data

Number of pipes available to application processor for data channels,
and product-code field of enumeration address needed for setting
these pipes can be different for different platforms.
Store this platform-specific information in platform-data, and get
it from Device-Tree if applicable.

Change-Id: I9a0ee0f34231ce33e08bbc6dc6d0ed51a3aca9e0
Signed-off-by: Sagar Dharia <sdharia@codeaurora.org>