MLK-25283-4 PCI: imx: adjust the l1ss support to proper place

MLK-25283-4 PCI: imx: adjust the l1ss support to proper place

Add one final quirk to adjust the l1ss support to proper place.
Only enable the L1sub support when both RC and EP supports the L1sub.
In this case, remove the over-ride of the CLKREQ# signal, let HW to
control it automatically.
Since "dis_gpio" GPIO pin is used as M.2 Key-E interface PIN56 for
power control of EP device, adjust active sequence just after the
turn-on of the power domains.

Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
Reviewed-by: Jun Li <jun.li@nxp.com>