ARM: hpe: Drop unused includes

of_platform.h is not needed, so drop it.
Acked-by: Nick Hawkins <nick.hawkins@hpe.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230803-dt-header-cleanups-for-soc-v2-6-d8de2cc88bff@kernel.orgSigned-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/mach-hpe/gxp.c

 // SPDX-License-Identifier: GPL-2.0
 /* Copyright (C) 2022 Hewlett-Packard Enterprise Development Company, L.P. */
 
-#include <linux/of_platform.h>
 #include <asm/mach/arch.h>
 
 static const char * const gxp_board_dt_compat[] = {