cnss2: Restore PCIe config space before enable PCIe device

Enabling PCIe device will also modify PCIe config space so doing it
after PCIe config space has been restored.

Change-Id: Idcc8410696523dd80c3c339f380f963f986c94c5
Signed-off-by: Yue Ma <yuem@codeaurora.org>
Signed-off-by: wadesong <wadesong@codeaurora.org>