intrapred test: use av1_zero
intrapred test: use av1_zero

Instead of memset

Change-Id: I2ff2de2847455fff1e4a7d70f8585b5e32c2950b

GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom