icnss: Add ICNSS platform driver

This is a snapshot of the icnss driver and
associated files as of msm-4.4 commit:

3c45c2a8a2a07a76e2d129d02561d061211e70c8
(Promotion of kernel.lnx.4.4-161119.)

CRs-Fixed: 1094870
Change-Id: Icac2b214d6c914cc2039b89aa4f6e9610a748746
Signed-off-by: Yuanyuan Liu <yuanliu@codeaurora.org>