msm: pcie: Set link state when the link is up.

Fix a bug where PCIe link state is set to be up when the link
initialization is actually not successful.

Change-Id: I8a6df88f8f9e0f8affa7f17a09759a603618fd7a
CRs-Fixed: 588928
Signed-off-by: Yan He <yanhe@codeaurora.org>