mfd: rn5t618: Add Ricoh RC5T619 PMIC support

The Ricoh RN5T567 is from the same family as the Ricoh RN5T618 is,
the differences are:

+ DCDC4/DCDC5
+ LDO7-10
+ Slightly different output voltage/currents
+ 32kHz Output
+ RTC
+ USB Charger detection

Signed-off-by: Pierre-Hugues Husson <phh@phh.me>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 0fde51e..4ce3b6f 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -894,7 +894,8 @@
 	select MFD_CORE
 	select REGMAP_I2C
 	help
-	  Say yes here to add support for the Ricoh RN5T567 or R5T618 PMIC.
+	  Say yes here to add support for the Ricoh RN5T567,
+          RN5T618, RC5T619 PMIC.
 	  This driver provides common support for accessing the device,
 	  additional drivers must be enabled in order to use the
 	  functionality of the device.