vppinfra: mspace_get_aligned should respect MALLOC_ALIGNMENT
vppinfra: mspace_get_aligned should respect MALLOC_ALIGNMENT

While underlying mspace_malloc() respects MALLOC_ALIGNMENT (16)
mspace_get_aligned moves start of data for 4 bytes making final result
not aligned to MALLOC_ALIGNED.

Type: fix
Change-Id: Ib1584f315e3658b3b748ebf4886fb7389ce640fe
Signed-off-by: Damjan Marion <9141bba8b2efed526e55cf796d48631af330ad98@cisco.com>

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