LoongArch: kvm: fix bug of kvm's hugepage

LoongArch inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I736F2



--------------------------------

The physical machine panics because KVM huge pages are not enabled,
When the virtual machine boots using huge pages.

Signed-off-by: lixianglai <lixianglai@loongson.cn>
Change-Id: I36463d85e5ce77dbe8a604e6fe9151b582fec576
(cherry picked from commit a5f0bd8f)