net: qualcomm: rmnet: Add support for 64 bit stats

Implement 64 bit per cpu stats.

CRs-Fixed: 2156182
Change-Id: I656b9682eed4ed6cdb91bee6e9c6612fc90b40ce
Signed-off-by: David S. Miller <davem@davemloft.net>
Git-commit: 192c4b5d48f2ae25a4ce323b4cb8b024fac3efd2
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>