AOSP/DeskClock - Add Kotlin files for remaining widget classes

Test: manual - Tested DeskClock UI. As well tests were run as follows

$ source build/envsetup.sh
$ lunch aosp_sargo-userdebug
$ make DeskClockKotlin
$ adb install out/target/product/sargo/product/app/DeskClockKotlin/DeskClockKotlin.apk
$ atest DeskClockTests

BUG: 157255731
Change-Id: I4628b02ce300107797603b7a26ead9f17812128b
5 files changed