arm64/sve: Make fpsimd_bind_task_to_cpu() static

This function is not referenced outside fpsimd.c so can be static, making
it that little bit easier to follow what is called from where.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20210730165846.18558-1-broonie@kernel.org


Reviewed-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>