PCI: mobiveil: Move the link up waiting out of mobiveil_host_init()

The host initializing sequence does not depend on the PCIe link being
up, so move the link up check right before the code scanning the root
bus for enumeration.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Minghuan Lian <Minghuan.Lian@nxp.com>
Reviewed-by: Subrahmanya Lingappa <l.subrahmanya@mobiveil.co.in>