doc: update SNOW3G installation section
doc: update SNOW3G installation section

Intel's libsso_snow3g library has been moved to a
new location, under "Intel Resource & Design Center".
The installation section of this PMD has been updated
to include the new instructions.

Signed-off-by: Pablo de Lara <28355d9cfe41bb8148aea0fb24f47aae8f4217a1@intel.com>
Acked-by: Marko Kovacevic <32a723043e16bf2a3185e32c2e613ae1ee55288f@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk