cnss2: Fix bugs for driver debugfs nodes

Fix a bug for incorrect jumping out of a switch statement when
showing driver status debugfs node. PCIe link up/down description
is also missing for device boot debugfs node. Add them back.

Change-Id: I63f4b61e837643566cd6b802ce94191b7a96ba7e
CRs-fixed: 2059087
Signed-off-by: Yue Ma <yuem@codeaurora.org>