Revert "Reland "libutils: Introduce StaticString16"""

This reverts commit c55ac92bd6b6f14778758893730415f5328da530.

Reason for revert: Breaks down-stream branches. See b/140315617

Change-Id: I4937fdf4bdcc7a44d5f10700ecf2d5e96aef7d27
Merged-In: I8da93f2c9b95183e32d4a2ea895f90c449abbe4d
6 files changed