treewide: Migrate CONFIG_LAST_STAGE_INIT to Kconfig

Migrate the CONFIG_LAST_STAGE_INIT option to Kconfig.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
diff --git a/configs/controlcenterd_TRAILBLAZER_defconfig b/configs/controlcenterd_TRAILBLAZER_defconfig
index 83106bc..ce92f75 100644
--- a/configs/controlcenterd_TRAILBLAZER_defconfig
+++ b/configs/controlcenterd_TRAILBLAZER_defconfig
@@ -10,6 +10,7 @@
 # CONFIG_DISPLAY_BOARDINFO is not set
 CONFIG_BOARD_EARLY_INIT_F=y
 CONFIG_BOARD_EARLY_INIT_R=y
+CONFIG_LAST_STAGE_INIT=y
 # CONFIG_CMDLINE_EDITING is not set
 # CONFIG_AUTO_COMPLETE is not set
 # CONFIG_SYS_LONGHELP is not set