msm: pcie: restore security config during PCIe link up

The security config for PCIe controller is not retained when PCIe
link is turned off. Thus, restore security config when PCIe link
is turned on.

Change-Id: Ie3a5238e40dd712e8d5e597b48b024c326d83c71
Signed-off-by: Tony Truong <truong@codeaurora.org>