iio: adc: lpc18xx_adc: Switch from of headers to mod_devicetable.h

There is nothing directly using of specific interfaces in this driver,
so lets not include the headers.

While at it, drop dependency to OF, which currently makes no sense.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20220531212218.72189-1-andriy.shevchenko@linux.intel.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/Kconfig

@@ -562,7 +562,7 @@ config LP8788_ADC
 config LPC18XX_ADC
 	tristate "NXP LPC18xx ADC driver"
 	depends on ARCH_LPC18XX || COMPILE_TEST
-	depends on OF && HAS_IOMEM
+	depends on HAS_IOMEM
 	help
 	  Say yes here to build support for NXP LPC18XX ADC.
 

drivers/iio/adc/lpc18xx_adc.c

@@ -17,10 +17,9 @@
 #include <linux/iio/driver.h>
 #include <linux/io.h>
 #include <linux/iopoll.h>
+#include <linux/mod_devicetable.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
-#include <linux/of.h>
-#include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/consumer.h>