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/P1010RDB-PA_36BIT_NOR_SECBOOT_defconfig b/configs/P1010RDB-PA_36BIT_NOR_SECBOOT_defconfig
index 45f531c..b1c746e 100644
--- a/configs/P1010RDB-PA_36BIT_NOR_SECBOOT_defconfig
+++ b/configs/P1010RDB-PA_36BIT_NOR_SECBOOT_defconfig
@@ -12,6 +12,7 @@
 CONFIG_BOOTDELAY=10
 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_I2C=y