linux-imx

i2c: aspeed: added documentation for Aspeed I2C driver

Added device tree binding documentation for Aspeed I2C busses.

Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>