treewide: Migrate CONFIG_BOARD_EARLY_INIT_R to Kconfig

Migrate the CONFIG_BOARD_EARLY_INIT_R option to Kconfig.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
diff --git a/configs/T1040D4RDB_SECURE_BOOT_defconfig b/configs/T1040D4RDB_SECURE_BOOT_defconfig
index 4a33062..4760a19 100644
--- a/configs/T1040D4RDB_SECURE_BOOT_defconfig
+++ b/configs/T1040D4RDB_SECURE_BOOT_defconfig
@@ -12,6 +12,7 @@
 CONFIG_SILENT_CONSOLE=y
 CONFIG_SYS_CONSOLE_IS_IN_ENV=y
 CONFIG_BOARD_EARLY_INIT_F=y
+CONFIG_BOARD_EARLY_INIT_R=y
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_IMLS=y
 CONFIG_CMD_GREPENV=y