mel.conf: remove wayland from distro features

We do not want wayland to be included in distro features of mel by default. It
is needed in atp, where it is already being added in atp.conf

Signed-off-by: Fahad Usman <fahad_usman@mentor.com>
Merge pull request #143 from fahadusman/remove-wayland-from-mel

mel.conf: remove wayland from distro features