hwmon/smsc47b397: Convert to a platform driver

Convert the smsc47b397 driver from the nonsensical i2c-isa hack to a
regular platform driver.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 065851a..5216da0 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -477,8 +477,7 @@
 
 config SENSORS_SMSC47B397
 	tristate "SMSC LPC47B397-NC"
-	depends on HWMON && I2C && EXPERIMENTAL
-	select I2C_ISA
+	depends on HWMON && EXPERIMENTAL
 	help
 	  If you say yes here you get support for the SMSC LPC47B397-NC
 	  sensor chip.