ata: ahci-pci: Fix dependency on DM_PCI

File drivers/ata/ahci-pci.c calls function ahci_probe_scsi_pci() which is
compiled only when DM_PCI is enabled. So add missing dependency into
Kconfig.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>