vp9_filter: restore vp9_bilinear_filters alignment

the declaration containing the alignment in vp9_filter.h was removed in:
eb88b17 Make vp9 subpixel match vp8

fixes a crash in 32-bit builds

Change-Id: I9a97e6b4e8e94698e43ff79d0d8bb85043b73c61
1 file changed