linux-phytec-fsl

MLK-13365 pci: imx: fix imx6dl ep rc validation failure

The ep rc validation is failed on imx6dl.
Root cause:
The ref clk of imx6dl pcie is 100M(bit20 of PLL_ENET).
But the driver doesn't enable it.
Solution:
enable pci_bus clock in ep rc validation system, since
the parent of the pci_bus is the 100M.
The connection between ep and rc only have the TX/RX
parirs, there is no impaction when enable the pcie_bus
in pcie ep rc validation system.

Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>