PCI: qcom: Allow ASPM L1 and substates for 2.7.0

Allow ASPM L1 and its substates.  By default this is disabled in the qcom
specific hardware.  Enable it explicitly only for controllers belonging to
2_7_0.

This does not affect any link capability registers; it will allow the link
transitions to L1 and its substates only if they are already supported.

Link: https://lore.kernel.org/r/1657886366-32685-1-git-send-email-quic_krichai@quicinc.com
Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Acked-by: Stanimir Varbanov <svarbanov@mm-sol.com>