lavc/opusdsp: RISC-V V (128-bit) postfilter

This is implemented for a vector size of 128-bit. Since the scalar
product in the inner loop covers 5 samples or 160 bits, we need a group
multipler of 2.

To avoid reconfiguring the vector type, the outer loop, which loads
multiple input samples sticks to the same multipler. Consequently, the
outer loop loads 8 samples per iteration. This is safe since the minimum
period of the CELT codec is 15 samples.

The same code would also work, albeit needlessly inefficiently with a
vector length of 256 bits. A proper implementation will follow instead.

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