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>
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 5868e1a..b432584 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -497,8 +497,7 @@
 
 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.