This re-uses the existing NEOVERSEN2 8x4 `sbgemm` kernel to implement `bgemm`.

- Adds bgemv T based off of sbgemv T kernel
- Adds bgemv N which is slightly alterated to not use Y as an
accumulator due to the output being bf16 which results in loss of
precision
- Enables BGEMM_GEMV_FORWARD to proxy BGEMM to BGEMV with new kernels

SME1 based direct kernel (with alpha and beta) for cblas_sgemm level 3

- Sets up all the various entrypoints for `bgemv`
- Adds `bscal` for use in the `bgemv` interface
- Adds test cases for comparing `sgemv` and `bgemv`
- Adds generic kernels for `bgemv_n` and `bgemv_t` which are accurate
enough to pass above tests

This also improves the testing and generic kernel by re-using the BF16
conversion functions.

Built on top of https://github.com/OpenMathLib/OpenBLAS/pull/5357 and derived from https://github.com/OpenMathLib/OpenBLAS/pull/5287

Co-authored-by: Ye Tao <ye.tao@arm.com>

Add infrastructure for BGEMM

Setting up all the infrastructure for BGEMM support in OpenBLAS, hopefully I found all the right places.

Derived mostly from the previous work done in https://github.com/OpenMathLib/OpenBLAS/pull/5287

Co-authored-by: Ye Tao <ye.tao@arm.com>

Add support for FP16 to openBLAS and shgemm on RISCV

Add support for Ampere AmpereOne processors

- adjust interface to disable "small matrix" pathway
- separate HFLOAT16 from BFLOAT16
- remove SHGEMM_UNROLL_M and SHGEMM_UNROLL_N equal conditions

Related to PR#5290
Co-authored-by Martin

kernel/riscv64: Fix cscal/zscal for riscv64_generic

kernel/(x86|sparc): Fix cscal and zscal by reverting to the generic C kernels

kernel/riscv64: Fix cscal and zscal

kernel/zarch: Fix cscal and zscal

kernel/power: Fixed cscal and zscal

kernel/arm64: fixed cscal and zscal

kernel/x86_64: fixed cscal and zscal

kernel/generic: Fixed cscal and zscal

- Calculate predicate outside the loop
- Divide matrix in blocks of 3

kernel/riscv64:fixed the performance problem in RISCV64_ZVL256 when OPENBLAS_K is small

- modify the macro conditions in Makefile.system
- Delete development test code

Related to issue#5279

Added HFLOAT16 support for RISCV64
Added shgemm_kernel_8x8 for RISCV64_ZVL128B and shgemm_kernel_16x8 for RISCV64_ZVL256B based on HFLOAT16
The instruction sets used are ZVFH and ZFH, which need to be supported by RVV1.0

Related to issue #5279
Co-authored-by Linjin Li <linjin_li@163.com>