Revert "dt-bindings: i2c: riic: Rename bindings documentation file"

This reverts commit 684ca712.
I overlooked that the Rev-by tag was given in advance assuming a fix was
made for the next revision.
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

MAINTAINERS

@@ -13628,7 +13628,7 @@ F:	drivers/clk/renesas/
 RENESAS EMEV2 I2C DRIVER
 M:	Wolfram Sang <wsa+renesas@sang-engineering.com>
 S:	Supported
-F:	Documentation/devicetree/bindings/i2c/renesas,iic-emev2.txt
+F:	Documentation/devicetree/bindings/i2c/i2c-emev2.txt
 F:	drivers/i2c/busses/i2c-emev2.c
 
 RENESAS ETHERNET DRIVERS