[av1] Fix build issues

This revision of libaom has some conflicts with our vendor script
and build system. A number of new .asm files have the same basename
as .c files, which our build system cannot handle.

To work around this, I manually renamed the conflicting
files in the filesystem and sources.mozbuild.

Also add av1_convolve_scale_sse4.c to sources.mozbuild manually.
This is needed by the build but for some reason isn't picked up
by generate_sources_mozbuild.sh.

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