hwmon: (lm95234) Convert to use regmap

Use regmap to replace local caching and to be able to use regmap API
functions.

No functional change.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/Kconfig

@@ -1532,6 +1532,7 @@ config SENSORS_LM93
 config SENSORS_LM95234
 	tristate "National Semiconductor LM95234 and compatibles"
 	depends on I2C
+	select REGMAP_I2C
 	help
 	  If you say yes here you get support for the LM95233 and LM95234
 	  temperature sensor chips.