LoongArch: KVM: Fix typo issue about GCFG feature detection

LoongArch: KVM: Fix typo issue about GCFG feature detection

[ Upstream commit bdb13252e5d1518823b81f458d9975c85d5240c2 ]

This is typo issue and misusage about GCFG feature macro. The code
is wrong, only that it does not cause obvious problem since GCFG is
set again on vCPU context switch.

Fixes: 0d0df3c99d4f ("LoongArch: KVM: Implement kvm hardware enable, disable interface")
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Sasha Levin <sashal@kernel.org>