i2c: jz4780: Add compatible string for JZ4770 SoC

The I2C controller in the JZ4770 SoC seems to work the exact same as in
the JZ4780 SoC.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
1 file changed