i2c: acpi: Move I2C bits from acpi.h to i2c.h

As discussed previously the best location for certain bus related bits,
e.g. I2C, is its own realm of the headers.

In order to uncontaminate acpi.h move the I2C bits to i2c.h.

There is no functional change intended.

Link: https://lkml.org/lkml/2018/11/28/744Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

include/linux/acpi.h

@@ -1061,17 +1061,6 @@ static inline int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
 }
 #endif
 
-#if defined(CONFIG_ACPI) && IS_ENABLED(CONFIG_I2C)
-bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares,
-			       struct acpi_resource_i2c_serialbus **i2c);
-#else
-static inline bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares,
-					     struct acpi_resource_i2c_serialbus **i2c)
-{
-	return false;
-}
-#endif
-
 /* Device properties */
 
 #ifdef CONFIG_ACPI

include/linux/i2c.h

@@ -967,11 +967,21 @@ static inline int of_i2c_get_board_info(struct device *dev,
 
 #endif /* CONFIG_OF */
 
+struct acpi_resource;
+struct acpi_resource_i2c_serialbus;
+
 #if IS_ENABLED(CONFIG_ACPI)
+bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares,
+			       struct acpi_resource_i2c_serialbus **i2c);
 u32 i2c_acpi_find_bus_speed(struct device *dev);
 struct i2c_client *i2c_acpi_new_device(struct device *dev, int index,
 				       struct i2c_board_info *info);
 #else
+static inline bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares,
+					     struct acpi_resource_i2c_serialbus **i2c)
+{
+	return false;
+}
 static inline u32 i2c_acpi_find_bus_speed(struct device *dev)
 {
 	return 0;