iio: addac: stx104: Replace bitops.h header inclusion with bits.h

The <linux/bitops.h> header is included in the stx104 driver so that we
can use the BIT() macro. This macro is actually defined in the
<linux/bits.h> header, so replace the <linux/bitops.h> header inclusion
with <linux/bits.h>.
Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
Link: https://lore.kernel.org/r/20230318185503.341914-1-william.gray@linaro.orgSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/addac/stx104.c

@@ -3,7 +3,7 @@
  * IIO driver for the Apex Embedded Systems STX104
  * Copyright (C) 2016 William Breathitt Gray
  */
-#include <linux/bitops.h>
+#include <linux/bits.h>
 #include <linux/device.h>
 #include <linux/errno.h>
 #include <linux/gpio/driver.h>