Remove clang build from travis
Remove clang build from travis

Resolves: LE-10419
Change-Id: I5a6d72f9d934f68f20b2b8f262ffba6121b4e84d

legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af