i2c-bfin-twi: Disable BF54x support for now

The i2c-bfin-twi driver doesn't support BF54x for now due to
missing header definitions causing the build to fail. Exclude
it for now, it will be enabled again later.
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

drivers/i2c/busses/Kconfig

@@ -100,7 +100,7 @@ config I2C_AU1550
 
 config I2C_BLACKFIN_TWI
 	tristate "Blackfin TWI I2C support"
-	depends on BF534 || BF536 || BF537 || BF54x
+	depends on BF534 || BF536 || BF537
 	help
 	  This is the TWI I2C device driver for Blackfin 534/536/537/54x.
 	  This driver can also be built as a module.  If so, the module