The CMakeLists injects CONFIG_ESP_REV_MIN_FULL and CONFIG_XTAL_FREQ on
the command line because those symbols live in esp_common's Kconfig,
which is outside the G0 closure and is not loaded during a restricted
COMPONENTS build. When every discovered component's Kconfig is processed
(IDF_BUILD_V2) the symbols are already defined via their Kconfig
defaults, and the additional -D would conflict with the existing
definition.
Gate the injection so it only runs when the Kconfig is not processed.
6084733b91