[PATCH] rijndael-riscv-zvkned: fix m4 grouping when VLEN greater than 128

[Michael Neuling]

Jussi,

> Implementation was making wrong assumptions about m4 grouping with
> different VLEN configurations. Implementation did work with VLEN=128
> but broke apart with VLEN=256, etc when VLEN>128. This commit switches
> riscv-zvkned to use vslideup/vslidedown for setting up m4 vector group
> with 4x128-bits data from four vectors with 128-bits of data.
>
> Tested with "qemu-riscv64 -cpu max,vlen={128, 256, 512, 1024}".
>
> Reported-by: Michael Neuling <mikey at neuling.org>
> Signed-off-by: Jussi Kivilinna <jussi.kivilinna at iki.fi>

Tested-by: Michael Neuling <mikey at neuling.org>

This works here. Thanks for the quick turnaround.

Mikey