vp9_rtcd: correct avx2 references
vp9_rtcd: correct avx2 references

s/"\$avx2_x86inc"/"avx2"/

avx2 code is all intrinsics and as a result doesn't rely on x86inc.asm

Change-Id: I76ad39474d8a00658f3e43131830ef0f4f34772a

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