LoongArch: Save LBT before FPU in setup_sigcontext()

LoongArch: Save LBT before FPU in setup_sigcontext()

[ Upstream commit 112ca94f6c3b3e0b2002a240de43c487a33e0234 ]

Now if preemption happens between protected_save_fpu_context() and
protected_save_lbt_context(), FTOP context is lost. Because FTOP is
saved by protected_save_lbt_context() but protected_save_fpu_context()
disables TM before that. So save LBT before FPU in setup_sigcontext()
to avoid this potential risk.

Signed-off-by: Hanlu Li <lihanlu@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Sasha Levin <sashal@kernel.org>