[PATCH v2 3/5] iio: dac: ad5504: Align headers with IWYU principle

[Taha Ed-Dafili <0rayn.dev@gmail.com>]

Update the header inclusions to follow the IWYU principle.

- Remove <linux/fs.h> and <linux/slab.h> as they are unused. The driver
relies on devm_ managed allocations, so slab is not required.

- Replace <linux/bitops.h> with <linux/bits.h> as only the BIT() and
GENMASK() macros are used.

- Add <linux/mod_devicetable.h> for struct spi_device_id.

- Add <linux/errno.h> and <linux/types.h> for error codes and data types.

Suggested-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Taha Ed-Dafili <0rayn.dev@gmail.com>
---
 drivers/iio/dac/ad5504.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/dac/ad5504.c b/drivers/iio/dac/ad5504.c
index 20a36e4a389e..e71218c44982 100644
--- a/drivers/iio/dac/ad5504.c
+++ b/drivers/iio/dac/ad5504.c
@@ -5,16 +5,17 @@
  * Copyright 2011 Analog Devices Inc.
  */
 
-#include <linux/bitops.h>
+#include <linux/bits.h>
 #include <linux/device.h>
-#include <linux/fs.h>
+#include <linux/errno.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
 #include <linux/module.h>
 #include <linux/regulator/consumer.h>
-#include <linux/slab.h>
 #include <linux/spi/spi.h>
 #include <linux/sysfs.h>
+#include <linux/types.h>
 
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
-- 
2.47.3