i2c: Remove CONFIG_I2C_MULTI_BUS

This functionality is part of the legacy I2C subsystem and is currently
unused anywhere.  Remove the remaining references.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/README b/README
index c0f55b2..1209633 100644
--- a/README
+++ b/README
@@ -984,21 +984,13 @@
 		CFG_SYS_I2C_NOPROBES
 
 		This option specifies a list of I2C devices that will be skipped
-		when the 'i2c probe' command is issued.	 If CONFIG_I2C_MULTI_BUS
-		is set, specify a list of bus-device pairs.  Otherwise, specify
-		a 1D array of device addresses
+		when the 'i2c probe' command is issued.
 
 		e.g.
-			#undef	CONFIG_I2C_MULTI_BUS
 			#define CFG_SYS_I2C_NOPROBES {0x50,0x68}
 
 		will skip addresses 0x50 and 0x68 on a board with one I2C bus
 
-			#define CONFIG_I2C_MULTI_BUS
-			#define CFG_SYS_I2C_NOPROBES	{{0,0x50},{0,0x68},{1,0x54}}
-
-		will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
-
 		CFG_SYS_RTC_BUS_NUM
 
 		If defined, then this indicates the I2C bus number for the RTC.