qcacmn: Add OS abstraction for NSEC_PER_MSEC

Currently code that is os-abstracted is referencing the
Linux-specific macro NSEC_PER_MSEC which violates the software
architecture. Introduce a new QDF macro to os-abstract this
Linux-specific macro.

CRs-Fixed: 2210748
Change-Id: I519773f2fd2a7227a285cf3832a758005a0f3900
2 files changed