i2c, ppc4xx_i2c: switch to new multibus/multiadapter support

Signed-off-by: Dirk Eibach <dirk.eibach@gdsys.cc>
Cc: Heiko Schocher <hs@denx.de>
Cc: Stefan Roese <sr@denx.de>
Tested-by: Stefan Roese <sr@denx.de>
diff --git a/README b/README
index c67106d..d0aeb52 100644
--- a/README
+++ b/README
@@ -1985,6 +1985,11 @@
 		 - This driver adds 4 i2c buses with a fix speed from
 		   100000 and the slave addr 0!
 
+		- drivers/i2c/ppc4xx_i2c.c
+		  - activate this driver with CONFIG_SYS_I2C_PPC4XX
+		  - CONFIG_SYS_I2C_PPC4XX_CH0 activate hardware channel 0
+		  - CONFIG_SYS_I2C_PPC4XX_CH1 activate hardware channel 1
+
 		additional defines:
 
 		CONFIG_SYS_NUM_I2C_BUSES