vlib: vlib_buffer_t should be always 128 bytes, not 2 cachelines
vlib: vlib_buffer_t should be always 128 bytes, not 2 cachelines

Fixes issues on systems with 128-byte cacheline.

Type: fix
Change-Id: I33689ffa5ef0a879b4bf93c25d48618dd43daf58
Signed-off-by: Damjan Marion <9141bba8b2efed526e55cf796d48631af330ad98@cisco.com>

chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp