[U-Boot] [Patch] soft_i2c.c compiler/linker error

[Jens Scharsig <esw@bus-elektronik.de>]

This patch fix the compiler/linker errors

common/cmd_i2c.c:1252: undefined reference to `i2c_get_bus_speed'
common/cmd_i2c.c:1256: undefined reference to `i2c_set_bus_speed'

if board use CONFIG_I2C_CMD_TREE and CONFIG_I2C_MULTI_BUS is not uesd/undef

Signed-off-by: Jens Scharsig <esw@bus-elektronik.de>
---

diff --git a/drivers/i2c/soft_i2c.c b/drivers/i2c/soft_i2c.c
index ed5f5b2..68b267f 100644
--- a/drivers/i2c/soft_i2c.c
+++ b/drivers/i2c/soft_i2c.c
@@ -246,6 +246,7 @@ int i2c_set_bus_num(unsigned int bus)
 #endif
 	return 0;
 }
+#endif
 
 /* TODO: add 100/400k switching */
 unsigned int i2c_get_bus_speed(void)
@@ -260,7 +261,7 @@ int i2c_set_bus_speed(unsigned int speed)
 
 	return 0;
 }
-#endif
+
 
 /*-----------------------------------------------------------------------
  * if ack == I2C_ACK, ACK the byte so can continue reading, else