Bug fix for Arm-aarch64 Segmentation fault.
Bug fix for Arm-aarch64 Segmentation fault.

aarch64 compiler optimizes out "& 0xffff"
in av1_extract_interp_filter() resulting in invalid filter params.

As a workaround 0xf is used instead of 0xffff
BUG=aomedia:1902

Change-Id: I24b6a30196652b745bbf8a9718656efa97c9abc3

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