arm64/fpsimd: Remove opportunistic freeing of SME state

arm64/fpsimd: Remove opportunistic freeing of SME state

When a task's SVE vector length (NSVL) is changed, and the task happens
to have SVCR.{SM,ZA}=={0,0}, vec_set_vector_length() opportunistically
frees the task's sme_state and clears TIF_SME.

The opportunistic freeing was added with no rationale in commit:

  d4d5be94a8787242 ("arm64/fpsimd: Ensure SME storage is allocated after SVE VL changes")

That commit fixed an unrelated problem where the task's sve_state was
freed while it could be used to store streaming mode register state,
where the fix was to re-allocate the task's sve_state.

There is no need to free and/or reallocate the task's sme_state when the
SVE vector length changes, and there is no need to clear TIF_SME. Given
the SME vector length (SVL) doesn't change, the task's sme_state remains
correctly sized.

Remove the unnecessary opportunistic freeing of the task's sme_state
when the task's SVE vector length is changed. The task's sme_state is
still freed when the SME vector length is changed.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250409164010.3480271-5-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>