hwmon/via686a: Convert to a platform driver

Convert the via686a driver from the nonsensical i2c-isa hack to a
regular platform driver.
Signed-off-by: Jean Delvare <khali@linux-fr.org>

drivers/hwmon/Kconfig

@@ -497,8 +497,7 @@ config SENSORS_SMSC47B397
 
 config SENSORS_VIA686A
 	tristate "VIA686A"
-	depends on I2C && PCI
-	select I2C_ISA
+	depends on PCI
 	help
 	  If you say yes here you get support for the integrated sensors in
 	  Via 686A/B South Bridges.