Rename ExtendedAccumulator::Wrap enumerators

Avoid using all caps for enumerator names because glibc's math.h
defines macros named UNDERFLOW and OVERFLOW. Upgrading libc++
incidentally includes math.h in more places, causing build errors.

Bug: 175635923
Test: m MODULES-IN-frameworks-av-media-utils
Change-Id: If07936bd8b2209f59cd53b85066a854451eac1ae