Use SVE kernel for SGEMM/DGEMM on Arm(R) Neoverse(TM) V1

Propagate SWITCH_RATIO to DYNAMIC_ARCH builds

This re-spins #3869 with some additional copy unrolling which helps maintain SYRK performance.

After #3868, the SVE kernels represent a pretty good boost.

This re-uses ARMV8SVE as a base and I'm going to incrementally move everything to use ARMV8SVE in additional patches (as well as fix up anything that's not already in ARMV8SVE).

This seems like a good balance of values for reasonably sized matrices. With `SWITCH_RATIO=16` the DGEMM scales better to bigger sizes but the better solution would be some kind of
thread throttling so I've gone with `SWITCH_RATIO=8`.

Previously dynamic builds were either using the default SWITCH_RATIO
or one from the higher level architecture; this patch ensures the
dynamic builds can use this parameter as well.

From testing this yields better results than the default of `2`.

It is really dangerous to fallback to Loongson core on other
MIPS64 processors.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>

1. Modify the algorithm to resolve multithreading failures
    2. No memory allocation in sbgemm kernel
    3. Optimize when alpha == 1.0f

implement ncopy tcopy kernel_8x4

SVE zgemm&cgemm (and other BLAS 3 complex)

Fix recent SkylakeX/DYNAMIC_ARCH DGEMM breakage

OpenBLAS: aarch64: Add neoverse-v1/n2 architecture specifics

Add sgemm part for Arm SVE

Fallback for Power kernels

Add dgemm kernel for arm64 SVE

Win64 uses LLP64 datamodel and unsigned long is only 32-bit. For 64-bit
architecture we need 64-bit mask to correctly generate address