board: ls1046ardb: force PCI device enumeration

board: ls1046ardb: force PCI device enumeration

Commit 2bb9bf99aaac ("configs: enable DM_ETH support for LS1046ARDB")
resulted in the PCI bus no longer being implicitly enumerated.

However, this is necessary for the fdt pcie fixups to work.

Therefore, similar to commit 5fdf9d6e0d53 ("board: ls1088ardb:
transition to DM_ETH"), pci_init() is now called in the board_init()
routine when CONFIG_DM_ETH is active.

Signed-off-by: Martin Schiller <ms@dev.tdt.de>
CC: Priyanka Jain <priyanka.jain@nxp.com>
Acked-by: Camelia Groza <camelia.groza@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>