LoongArch: pci root bridige set acpi companion only when not acpi_disabled.

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



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Fix patch "LoongArch: Add PCI controller support"

Signed-off-by: Tianli Xiong <xiongtianli@loongson.cn>
Change-Id: If6084f05cc42ac33b44a7b6aeabdd1366a0bccdd