staging: hikey9xx: hi6421-spmi-pmic: simplify includes

There are several uneeded includes. Remove them.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/50087bb41fc262d6930aeda0583546cf9d597b87.1611212783.git.mchehab+huawei@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/hikey9xx/hi6421-spmi-pmic.c

@@ -7,20 +7,12 @@
 //
 // Copyright (c) 2020-2021 Huawei Technologies Co., Ltd
 
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/err.h>
 #include <linux/interrupt.h>
-#include <linux/io.h>
 #include <linux/irq.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/hi6421-spmi-pmic.h>
 #include <linux/module.h>
-#include <linux/of_address.h>
-#include <linux/of_device.h>
 #include <linux/of_gpio.h>
-#include <linux/of.h>
-#include <linux/of_irq.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/spmi.h>