Inline the custom Lazy implementation in shell

This causes difficulties from the clockwork shell implementation
building `wm_shell-shared-utils` into binaries both from source and
as a library.

Change-Id: Ifb627a5d091d9bb6dcf2810d2f8ae6ce7745b46b
Test: cf_gwear_x86-trunk_staging-userdebug
Flag: EXEMPT proguard is not flaggable
Bug: 382028320