pci/quirks: ls7a2000: fix pm transition of devices under pcie port

LoongArch inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I6BWFP



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Signed-off-by: Jianmin Lv <lvjianmin@loongson.cn>
Change-Id: Ie2c78cc46aa7bde00395906f7e6ab6a09e09a190
(cherry picked from commit d6ac51fc)