[qca-nss-ecm] Improved IP and MAC address string handling.

- Replace sprintf with snprintf
- Donot use ecm_ip_addr_to_string() function where the
  IP version is known. Instead use the IPv4 and IPv6 formatting
  macros.
- Removed unused string code from the neigbour solicitation send
  function.

Change-Id: Iefc73478e5e99f7c67af259000a1f95adb8aae0a
Signed-off-by: Murat Sezgin <msezgin@codeaurora.org>
4 files changed