lib: utils/ipi: Convert IPI drivers as early drivers

The fdt_ipi_init() is already called from generic_early_init() so
let's convert IPI drivers as early drivers.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Samuel Holland <samuel.holland@sifive.com>
Tested-by: Nick Hu <nick.hu@sifive.com>
Link: https://lore.kernel.org/r/20250904052410.546818-4-apatel@ventanamicro.com
Signed-off-by: Anup Patel <anup@brainfault.org>

include/sbi_utils/ipi/fdt_ipi.h

@@ -1,26 +0,0 @@
-/*
- * SPDX-License-Identifier: BSD-2-Clause
- *
- * Copyright (c) 2020 Western Digital Corporation or its affiliates.
- *
- * Authors:
- *   Anup Patel <anup.patel@wdc.com>
- */
-
-#ifndef __FDT_IPI_H__
-#define __FDT_IPI_H__
-
-#include <sbi/sbi_types.h>
-#include <sbi_utils/fdt/fdt_driver.h>
-
-#ifdef CONFIG_FDT_IPI
-
-int fdt_ipi_init(void);
-
-#else
-
-static inline int fdt_ipi_init(void) { return 0; }
-
-#endif
-
-#endif