[qca-nss-drv] Fix copyright header to carry previous years

This brings back the year 2013 in the copyright header of nss_core.c
and nss_stats.c. It is required by legal to preserve previous years on the
copyright header and not overwrite them.

Change-Id: Ie54fe17a3a9ce7bc0cbdba3ca40b5521d085945c
Signed-off-by: Sakthi Vignesh Radhakrishnan <sradhakr@codeaurora.org>
2 files changed