MLK-19194 PCI: imx: disable the ltssm when link is down in uboot

Disable the LTSSM when link is down in uboot.
Otherwise, the pcie ep/rc validation system in kernel
would be impacted by the enabled ltssm stat in the uboot.

Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
Reviewed-by: Ye Li <ye.li@nxp.com>
(cherry picked from commit cdedbb42e052d4bb3ff6b45044dd0d6023f3cb20)
1 file changed