rmnet: advanced flow packet steering

Provides initial hook framework to develop a
smart flow steering solution. Hook function
added in rmnet data path to allow for offloaded
hash computation.

CRs-Fixed: 2277154
Change-Id: I61bcc321fa2b612308ce54c28953c1df956a0fe5
Acked-by: Raul Martinez <mraul@qti.qualcomm.com>
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
Signed-off-by: Conner Huff <chuff@codeaurora.org>