gd/hal/snoop_logger: Make explicit call to DumpSnoozLogToFile

Previously this method was indirectly called from the function
GetDumpsysData, which itself is indirectly called by the module
dumper; this entire chain of call is fragile.

This change makes to method DumpSnoozLogToFile public and calls
it directly from the dumpsys implementation.

Bug: 331817295
Test: m com.android.btservices
Test: manual, validate that snooz files are generated on dumpsys
Flag: EXEMPT, no logical change
Change-Id: I4ae1e6883b847b4e325e1e79a190c7eec0c7c324