iio:adc:bcm_iproc: Drop of_match_ptr protection and switch to mod_devicetable.h

This driver cannot be instantiated from ACPI due to it's use of
syscon_regmap_lookup_by_phandle() but in the interests of clearing
this anti pattern out of IIO, let us switch to an explicit
check in Kconfig and remove the protections on the of_match_table
The switch of header is because we only use of_device_id
in here and that is defined in mod_devicetable.h not of.h.

Signed-off-by: Jonathan Cameron <[e-mail]>
Cc: Raveendra Padasalagi <[e-mail]>
Reviewed-by: Andy Shevchenko <[e-mail]>

drivers/iio/adc/Kconfig

···
 
 config BCM_IPROC_ADC
 	tristate "Broadcom IPROC ADC driver"
-	depends on ARCH_BCM_IPROC || COMPILE_TEST
+	depends on (ARCH_BCM_IPROC && OF) || COMPILE_TEST
 	depends on MFD_SYSCON
 	default ARCH_BCM_CYGNUS
 	help

drivers/iio/adc/bcm_iproc_adc.c

···
  */
 
 #include <linux/module.h>
-#include <linux/of.h>
+#include <linux/mod_devicetable.h>
 #include <linux/io.h>
 #include <linux/clk.h>
 #include <linux/mfd/syscon.h>
···
 	.remove	= iproc_adc_remove,
 	.driver	= {
 		.name	= "iproc-static-adc",
-		.of_match_table = of_match_ptr(iproc_adc_of_match),
+		.of_match_table = iproc_adc_of_match,
 	},
 };
 module_platform_driver(iproc_adc_driver);