i2c: Remove CFG_SYS_I2C_DIRECT_BUS

Now that this is always 1, remove it and the associated dead code.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heiko Schocher <hs@denx.de>
diff --git a/README b/README
index 4ffa4b8..4be1e8c 100644
--- a/README
+++ b/README
@@ -771,13 +771,8 @@
 		CFG_SYS_NUM_I2C_BUSES
 		Hold the number of i2c buses you want to use.
 
-		CFG_SYS_I2C_DIRECT_BUS
-		define this, if you don't use i2c muxes on your hardware.
-
 		CFG_SYS_I2C_BUSES
-		hold a list of buses you want to use, only used if
-		CFG_SYS_I2C_DIRECT_BUS is not defined, for example
-		a board with CFG_SYS_NUM_I2C_BUSES = 9:
+		hold a list of buses you want to use
 
 		 CFG_SYS_I2C_BUSES	{{0, {I2C_NULL_HOP}}, \
 					{0, {{I2C_MUX_PCA9547, 0x70, 1}}}, \