i2c: sun6i-p2wi: make bindings file name match the driver

If we use the "i2c-" prefix for the binding documentation file name,
then it should match the file name of the driver, if possible. It is
possible for this driver, so rename it.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
diff --git a/Documentation/devicetree/bindings/i2c/i2c-sunxi-p2wi.txt b/Documentation/devicetree/bindings/i2c/i2c-sun6i-p2wi.txt
similarity index 100%
rename from Documentation/devicetree/bindings/i2c/i2c-sunxi-p2wi.txt
rename to Documentation/devicetree/bindings/i2c/i2c-sun6i-p2wi.txt