Compile bug: SME2 used unconditionally even when only SME is present

[mediouni-m]

Git commit

304ac56

Operating systems

Linux

GGML backends

CPU

Problem description & steps to reproduce

Mass-market SME silicon without SME2 is coming.

KleidiAI SME2 kernels are used with only checking for __ARM_FEATURE_SME. That's an unsafe thing to do.

First Bad Commit

No response

Compile command

cmake ..

Relevant log output

N/A, crash on affected silicon

[mediouni-m]

This is needed for the 3rd-gen Oryon chips announced yesterday