[U-Boot] build error with CONFIG_DM_PCI disabled in menuconfig

[Ding, ChiX]

Hi there
I disabled CONFIG_DM_PCI in menuconfig because I have problem detecting AHCI SCSI controller on X86 board
with CONFIG_DM_PCI enabled and the older code in drivers/pci/pci.c works for me in the previous U-boot version.
Then I got the build error :
u-boot/arch/x86/cpu/irq.c:29: undefined reference to `dm_pci_read_config8'
u-boot/arch/x86/cpu/irq.c:104: undefined reference to `dm_pci_get_bdf'
u-boot/arch/x86/cpu/irq.c:147: undefined reference to `dm_pci_read_config32'
u-boot/arch/x86/cpu/pci.c:69: undefined reference to `pci_read_config16'
u-boot/arch/x86/cpu/pci.c:73: undefined reference to `pci_read_config8'
u-boot/arch/x86/cpu/pci.c:86: undefined reference to `pci_write_config8'
u-boot/arch/x86/lib/bios_interrupts.c:137: undefined reference to `dm_pci_find_device'
u-boot/arch/x86/lib/bios_interrupts.c:141: undefined reference to `dm_pci_get_bdf'

It seems that the code refers to the DM_PCI code regardless if  CONFIG_DM_PCI is enabled or not.
Is it ok to build U-boot with CONFIG_DM_PCI disabled or  did I miss anything?

Thanks a lot,
Chi
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