Stop using VP9 convolve scheme in AV1 encoder.
Discontinue all VP9 style convolve rounding operations in the non-normative parts of the encoder. The function av1_convolve_2d_sr_c is forced instead of SIMD versions of the same function, because of incompatibility when round_1 > 0. In the -DCONFIG_LOWPRECISION_BLEND=2 -DCONFIG_HIGHPRECISION_INTBUF=1 setting, results on 15 frames of lowres (cpu-used=1) is -0.019% better. Change-Id: I72154bd896357c352c944fb2cd3b25bafafba46a
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