board: phytec: Commonize board code for K3 based SoMs

Environment handling code can be reused across all our K3 based SoMs.
Instead of adding the same code for every new SoM, move it to a common
board.c file.

Signed-off-by: Wadim Egorov <w.egorov@phytec.de>
diff --git a/board/phytec/common/k3/board.c b/board/phytec/common/k3/board.c
new file mode 100644
index 0000000..9cb168c
--- /dev/null
+++ b/board/phytec/common/k3/board.c
@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2024 PHYTEC Messtechnik GmbH
+ * Author: Wadim Egorov <w.egorov@phytec.de>
+ */
+
+#include <env_internal.h>
+#include <spl.h>
+#include <asm/arch/hardware.h>
+
+#if IS_ENABLED(CONFIG_ENV_IS_IN_FAT) || IS_ENABLED(CONFIG_ENV_IS_IN_MMC)
+int mmc_get_env_dev(void)
+{
+	u32 boot_device = get_boot_device();
+
+	switch (boot_device) {
+	case BOOT_DEVICE_MMC1:
+		return 0;
+	case BOOT_DEVICE_MMC2:
+		return 1;
+	};
+
+	return CONFIG_SYS_MMC_ENV_DEV;
+}
+#endif
+
+enum env_location env_get_location(enum env_operation op, int prio)
+{
+	u32 boot_device = get_boot_device();
+
+	if (prio)
+		return ENVL_UNKNOWN;
+
+	switch (boot_device) {
+	case BOOT_DEVICE_MMC1:
+	case BOOT_DEVICE_MMC2:
+		if (CONFIG_IS_ENABLED(ENV_IS_IN_FAT))
+			return ENVL_FAT;
+		if (CONFIG_IS_ENABLED(ENV_IS_IN_MMC))
+			return ENVL_MMC;
+	case BOOT_DEVICE_SPI:
+		if (CONFIG_IS_ENABLED(ENV_IS_IN_SPI_FLASH))
+			return ENVL_SPI_FLASH;
+	default:
+		return ENVL_NOWHERE;
+	};
+}
+
+#if IS_ENABLED(CONFIG_BOARD_LATE_INIT)
+int board_late_init(void)
+{
+	u32 boot_device = get_boot_device();
+
+	switch (boot_device) {
+	case BOOT_DEVICE_MMC1:
+		env_set_ulong("mmcdev", 0);
+		env_set("boot", "mmc");
+		break;
+	case BOOT_DEVICE_MMC2:
+		env_set_ulong("mmcdev", 1);
+		env_set("boot", "mmc");
+		break;
+	case BOOT_DEVICE_SPI:
+		env_set("boot", "spi");
+		break;
+	case BOOT_DEVICE_ETHERNET:
+		env_set("boot", "net");
+		break;
+	};
+
+	return 0;
+}
+#endif