cifs: print last update time for interface list

[ Upstream commit 05844bd6 ]

We store the last updated time for interface list while
parsing the interfaces. This change is to just print that
info in DebugData.

Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Stable-dep-of: fa1d0508 ("cifs: account for primary channel in the interface list")
Signed-off-by: Sasha Levin <sashal@kernel.org>