Update lockscreen to use config_headlineFontFamilyLight

Allows OEMs to update the font family that's used for various places in
lockscreen (clock, num pad, and PIN password text). Also updates the
various text sizes to new numbers.

Fixes: 62411304
Fixes: 62411119
Test: ag/2430512 and manual verification
Change-Id: I3ecd1b18bbefe61c6a9cc5f549966ecd71858c9c