boost: adding serialization to BOOST_LIBS

boost: adding serialization to BOOST_LIBS

Since its initial commit from the classic OpenEmbedded repository
in 43e94412c45b4b79485a64010c76d89b245bb235, serialization was
commented out, reportedly due to some issue with powerpc in the
boost version 1.36. In the classic OpenEmbedded repository,
serialization has been added again since version 1.4x.

The commit removes the outdated comment and adds serialization to
the BOOST_LIBS after testing `bitbake boost` and bitbaking some
applications using boost from the meta-ros layer for qemuppc.

(From OE-Core rev: a193d868a0c01a2998adb3e6eec9fc2748cca888)

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@oss.bmw-carit.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>