Update header inclusions to follow IWYU (Include What You Use)
principle.

Note that kernel.h is discouraged to be included as it's written
at the top of that file.

Reviewed-by: Linus Walleij <linusw@kernel.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/gpio/gpio-pca9570.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpio/gpio-pca9570.c b/drivers/gpio/gpio-pca9570.c
index eae35135c71e..a41837f1201b 100644
--- a/drivers/gpio/gpio-pca9570.c
+++ b/drivers/gpio/gpio-pca9570.c
@@ -9,11 +9,15 @@
  *	Andrew F. Davis <afd@ti.com>
  */
 
+#include <linux/bits.h>
+#include <linux/device/devres.h>
+#include <linux/errno.h>
 #include <linux/gpio/driver.h>
 #include <linux/i2c.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/property.h>
+#include <linux/types.h>
 
 #define SLG7XL45106_GPO_REG	0xDB
 
-- 
2.50.1