[E60] Add baord directory with basic board file

board/seco/rk3588_e60/Kconfig

+if TARGET_SECO_RK3588_E60
+
+config SYS_BOARD
+	default "rk3588_e60"
+
+config SYS_VENDOR
+	default "seco"
+
+config SYS_CONFIG_NAME
+	default "seco_rk3588_e60"
+
+config BOARD_SPECIFIC_OPTIONS # dummy
+	def_bool y
+
+endif

board/seco/rk3588_e60/Makefile

+#
+# (C) Copyright 2023 Seco Spa, Ltd
+#
+# SPDX-License-Identifier:     GPL-2.0+
+#
+
+obj-y  += rk3588_e60.o

board/seco/rk3588_e60/rk3588_e60.c

+/*
+ * SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+ *
+ * Copyright 2024 SECO
+ */
+
+#include <common.h>
+#include <dwc3-uboot.h>
+#include <usb.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#ifdef CONFIG_USB_DWC3
+static struct dwc3_device dwc3_device_data = {
+	.maximum_speed = USB_SPEED_HIGH,
+	.base = 0xfc000000,
+	.dr_mode = USB_DR_MODE_PERIPHERAL,
+	.index = 0,
+	.dis_u2_susphy_quirk = 1,
+	.usb2_phyif_utmi_width = 16,
+};
+
+int usb_gadget_handle_interrupts(void)
+{
+	dwc3_uboot_handle_interrupt(0);
+	return 0;
+}
+
+int board_usb_init(int index, enum usb_init_type init)
+{
+	return dwc3_uboot_init(&dwc3_device_data);
+}
+#endif