vulkan: multi-row k quants (ggml-org#10846)

* multi row k quant shaders!

* better row selection

* more row choices

* readjust row selection

* rm_kq=2 by default

flake.lock: Update (ggml-org#9068)

ggml: bugfix: fix the inactive elements is agnostic for risc-v vector (…

…ggml-org#8748)

In these codes, we want to retain the value that they previously held
when mask[i] is false. So we should use undisturbed. With the default
agnostic policy of rvv intrinsic, these values can be held or be
written with 1s.

Co-authored-by: carter.li <carter.li@starfivetech.com>