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/MPC8313ERDB_66_defconfig b/configs/MPC8313ERDB_66_defconfig
index 9472b06..6cd21d2 100644
--- a/configs/MPC8313ERDB_66_defconfig
+++ b/configs/MPC8313ERDB_66_defconfig
@@ -6,6 +6,7 @@
 CONFIG_OF_STDOUT_VIA_ALIAS=y
 CONFIG_SYS_EXTRA_OPTIONS="SYS_66MHZ"
 CONFIG_BOOTDELAY=6
+CONFIG_BOARD_EARLY_INIT_R=y
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_IMLS=y
 CONFIG_CMD_GPIO=y