only Linux system is supported now.

change the default value of `ENABLE_AKG` to off, and controlled by option `-K`.
the `ENABLE_AKG` is auto enabled when `ENABLE_GPU` or `ENABLE_D` is on.
since now, we can use `ENABLE_AKG` to control the compilation of graphkernel
and akg codes.

fix usage description for option "-K", it should be "[-K on|off]".

LLVM is required by akg for cpu kernels, so AKG for cpu is default disabled now.

fix code check

This reverts commit b077aa1cab.

Revert "[feat] [assistant] [I3T96X] add new Dataset operator LibriSpeechDataset"

This reverts commit 4e6f7dc97d.

delete pass_registry_test.cc

comment  hiai_nlu_model_multi.pb related  line

Merge pull request !21621 from lingyunli63/fix_recompute_fuse

fix pylint problem

fix conflict

fix op list

fix check warning

fix code based on review comments

update akg commit

fix check warning

Merge pull request !19081 from lingyunli63/add_ops_IsNan

Merge pull request !20508 from lingyunli63/fix_no_tensor_input

* add ops: LogicalNot, LogicalAnd, LogicalOr, NotEqual, EqualCount, Asinh, Acosh

Merge pull request !17626 from lingyunli63/matmul_to_mul

use data_format instead of format in op_infer

add pad and unpad inside conv2d expander

fix pad value

add limit in conv2d expander

From: @lingyunli63
Reviewed-by: 
Signed-off-by:

From: @wenfangpei
Reviewed-by: @gaoxiong1,@ckey_dou
Signed-off-by: @ckey_dou

From: @r1chardf1d0
Reviewed-by: @gaoxiong1,@ckey_dou
Signed-off-by: @ckey_dou