rockchip: ringneck-px30: enable SPL_BOARD_INIT

Now that Ringneck requires some board-specific code (namely resetting
the MCU companion controller) to be run during SPL stage, let's enable
SPL_BOARD_INIT.

Cc: Quentin Schulz <foss+uboot@0leil.net>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/configs/ringneck-px30_defconfig b/configs/ringneck-px30_defconfig
index f47dfa5..b314636 100644
--- a/configs/ringneck-px30_defconfig
+++ b/configs/ringneck-px30_defconfig
@@ -38,6 +38,7 @@
 CONFIG_SPL_HAS_BSS_LINKER_SECTION=y
 CONFIG_SPL_BSS_START_ADDR=0x4000000
 CONFIG_SPL_BSS_MAX_SIZE=0x4000
+CONFIG_SPL_BOARD_INIT=y
 CONFIG_SPL_BOOTROM_SUPPORT=y
 # CONFIG_SPL_RAW_IMAGE_SUPPORT is not set
 # CONFIG_SPL_SHARES_INIT_SP_ADDR is not set