dt-bindings: at24: add Renesas R1EX24128

Document the compatible value for the Renesas R1EX24128ASAS0A two-wire
serial interface EEPROM, so it can be used in DTS files without causing
checkpatch warnings.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
(cherry picked from commit 84e10623c0b9c81557918804f309d66aec86a233)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
diff --git a/Documentation/devicetree/bindings/eeprom/at24.txt b/Documentation/devicetree/bindings/eeprom/at24.txt
index a201a11..61d833a 100644
--- a/Documentation/devicetree/bindings/eeprom/at24.txt
+++ b/Documentation/devicetree/bindings/eeprom/at24.txt
@@ -49,6 +49,7 @@
 
                 "nxp,se97b" - the fallback is "atmel,24c02",
                 "renesas,r1ex24002" - the fallback is "atmel,24c02"
+                "renesas,r1ex24128" - the fallback is "atmel,24c128"
                 "rohm,br24t01" - the fallback is "atmel,24c01"
 
   - reg: The I2C address of the EEPROM.