mb/kontron/bsl6: Configure GPIOs using mainboard_ops

Hook up the mainboard_ops driver and configure the GPIOs using .init,
since mainboard_silicon_init_params() is meant for the configuration of
the FSP, not the GPIOs.

Change-Id: I6ab8d258c6f81c90d835cb8d07c6387d3de76d85
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47850
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/kontron/bsl6/ramstage.c

@@ -1,9 +1,13 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
-#include <soc/ramstage.h>
+#include <device/device.h>
 #include <mainboard/gpio.h>
 
-void mainboard_silicon_init_params(FSP_SIL_UPD *params)
+static void init_mainboard(void *chip_info)
 {
 	mainboard_configure_gpios();
 }
+
+struct chip_operations mainboard_ops = {
+	.init = init_mainboard,
+};