Fix test failure in av1_convolve_optimz_test.cc
Fix test failure in av1_convolve_optimz_test.cc

Call av1_convolve_init_# before testing convolve functionality.

Change-Id: I15c7c292251a7dbf2ea77a2778f8dc7049ae8334

luctrudeau/aom,GrokImageCompression/aom,luctrudeau/aom,GrokImageCompression/aom,GrokImageCompression/aom,luctrudeau/aom,smarter/aom,GrokImageCompression/aom,smarter/aom,luctrudeau/aom,smarter/aom,smarter/aom,smarter/aom,GrokImageCompression/aom,luctrudeau/aom,luctrudeau/aom,smarter/aom,GrokImageCompression/aom