Fix Debian Packaging on AARCH64

Fix Debian Packaging on AARCH64

Error msg:
pkg-shlibdeps: error: couldn't find library libvppinfra.so.0 needed by
debian/vpp/usr/bin/vpp_json_test (ELF format: 'elf64-littleaarch64'; RPATH: '')
dpkg-shlibdeps: error: couldn't find library libvppinfra.so.0 needed by
debian/vpp/usr/bin/svmdbtool (ELF format: 'elf64-littleaarch64'; RPATH: '')
...

Changes to create architecture specific folder in /usr/lib/

Change-Id: Id0e42b175348e32e2c72b404ff60eb87c9146968
Signed-off-by: Nitin Saxena <nsaxena@cavium.com>