msm: pcie: update with link power on check for user PCIe resume

Instead of checking PCIe S/W link state, check if the link is on
is on or off to determine whether PCIe resume should be allowed
or not. PCIe S/W link state is not enough to determine since
MSM_PCIE_LINK_DOWN state can be set for link on or off.

Change-Id: I23a27007eb90134c90d5a20034248697423ebeeb
Signed-off-by: Tony Truong <truong@codeaurora.org>