km/ppc: migrate all mpc83xx to DM_I2C

Enable DM_I2C and I2C mux to get rid of the usage of the legacy
i2c driver.

Signed-off-by: Holger Brunck <holger.brunck@hitachienergy.com>
diff --git a/configs/kmcoge5ne_defconfig b/configs/kmcoge5ne_defconfig
index 6bfcee9..9609f58 100644
--- a/configs/kmcoge5ne_defconfig
+++ b/configs/kmcoge5ne_defconfig
@@ -219,13 +219,10 @@
 CONFIG_SYS_BR4_PRELIM_BOOL=y
 CONFIG_SYS_BR4_PRELIM=0xB0000801
 CONFIG_SYS_OR4_PRELIM=0xF0000E25
-CONFIG_SYS_I2C_LEGACY=y
+CONFIG_DM_I2C=y
 CONFIG_SYS_I2C_FSL=y
-CONFIG_SYS_FSL_I2C_OFFSET=0x3000
-CONFIG_SYS_FSL_HAS_I2C2_OFFSET=y
-CONFIG_SYS_FSL_I2C2_OFFSET=0x3100
-CONFIG_SYS_I2C_SLAVE=0x7F
-CONFIG_SYS_I2C_SPEED=200000
+CONFIG_I2C_MUX=y
+CONFIG_I2C_MUX_PCA954x=y
 # CONFIG_MMC is not set
 CONFIG_MTD=y
 CONFIG_MTD_NOR_FLASH=y