gcam: Restore naming of Gcam debug folders.

When Gcam debugging is on, write output to per-burst folders
named SSSS_YYYYMMDD_HHMMSS_XXX, where 'SSSS' is the last 4
digits of the device serial number and 'XXX' are the
milliseconds of the timestamp.

Bug: 17204023

Change-Id: Ie1d58dc3ecb5d9dc7389d24acc4937498f00dbc9
1 file changed