fixup! Add support to configure double line clock in lockscreen [1/2]

Fetch the default value from overlay config which was originally
introduced in aosp/2527300 but was missed out in commit 9282e2c3.

Bug: 277244307
Flag: NONE Minor Bugfix
Test: atest KeyguardClockSwitchControllerTest
Change-Id: Ie8cb62e04b9fbc7f8d42fbefeceb0f7b11c342b1