- Convert a large number of CONFIG symbols to Kconfig. Of note is a
large chunk of USB symbols (and dead code removal), ensuring all
SPL/TPL/VPL symbols have an appropriate dependency, largely (but not
entirely) removing the testing of CONFIG_SPL_BUILD in board headers,
and allowing CONFIG_EXTRA_ENV_TEXT and CONFIG_EXTRA_ENV_SETTINGS to
co-exist as this facilities migration of many platforms.
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