leds-lp5523: support new LP55231 device

New TI LP55231 device has same I2C register layout as LP5523. Therefore,
all of LED operations can be shared with the LP5523 driver.

To support new LP55231 device explicitly, the device description
is added in the configuration file.

Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>

drivers/leds/Kconfig

@@ -192,11 +192,12 @@ config LEDS_LP5521
 	  programming the engines.
 
 config LEDS_LP5523
-	tristate "LED Support for N.S. LP5523 LED driver chip"
+	tristate "LED Support for TI/National LP5523/55231 LED driver chip"
 	depends on LEDS_CLASS && I2C
 	help
-	  If you say yes here you get support for the National Semiconductor
-	  LP5523 LED driver. It is 9 channel chip with programmable engines.
+	  If you say yes here you get support for TI/National Semiconductor
+	  LP5523/55231 LED driver.
+	  It is 9 channel chip with programmable engines.
 	  Driver provides direct control via LED class and interface for
 	  programming the engines.