Only register the primary KeyguardClockSwitchController w/ DumpManager

This prevents the KCSC associated with the secondary display from
dumping, but also prevents it from leaking after the secondary
display has been removed.

Bug: 295143740
Test: Manually checked with secondary display
Change-Id: Iebe14fad8e0a883c5f4fec7fb50bb6ce0107f8fc
Merged-In: Iebe14fad8e0a883c5f4fec7fb50bb6ce0107f8fc
1 file changed