Convert reorder-init-list warning into error

This would help us avoid this mistake at compile time, and standardize
our struct usage in the code.

Previously, this printed a warning during the build, but the build
succeeded.

Bug: 271455682
Test: m
Flag: EXEMPT PURE_REFACTOR
Change-Id: Ic7b27b885af5f6027a3baf5c1848f7fcfc7728f7