regulator: rtmv20: Add Richtek to Kconfig text

The other Richtek drivers has Richtek prefix, make it consistent.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Link: https://lore.kernel.org/r/20210530124101.477727-2-axel.lin@ingics.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/Kconfig

@@ -1011,7 +1011,7 @@ config REGULATOR_RT5033
 	  current source, LDO and Buck.
 
 config REGULATOR_RTMV20
-	tristate "RTMV20 Laser Diode Regulator"
+	tristate "Richtek RTMV20 Laser Diode Regulator"
 	depends on I2C
 	select REGMAP_I2C
 	help