[AArch64] NFC: Rename -force-streaming-compatible-sve to -force-streaming-compatible (#92774)

The behaviour of the flag should be equivalent to
__arm_streaming_compatible.

At the moment, the name suggests that '-force-streaming-compatible-sve'
on its own (i.e. without specifying `+sve`) enables the compiler to use
the streaming-compatible subset of SVE instructions, but the semantics
merely are that the function can be called with either PSTATE.SM=0 or
PSTATE.SM=1.