soft_i2c.c compiler/linker error

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 (wrong define order)

and

removes additional empty lines
Signed-off-by: NJens Scharsig <esw@bus-elektronik.de>

drivers/i2c/soft_i2c.c

@@ -51,14 +51,12 @@
 DECLARE_GLOBAL_DATA_PTR;
 #endif
 
-
 /*-----------------------------------------------------------------------
  * Definitions
  */
 
 #define RETRIES		0
 
-
 #define I2C_ACK		0		/* PD_SDA level to ack a byte */
 #define I2C_NOACK	1		/* PD_SDA level to noack a byte */
 
@@ -154,7 +152,6 @@ static void send_stop(void)
 	I2C_TRISTATE;
 }
 
-
 /*-----------------------------------------------------------------------
  * ack should be I2C_ACK or I2C_NOACK
  */
@@ -174,7 +171,6 @@ static void send_ack(int ack)
 	I2C_DELAY;
 }
 
-
 /*-----------------------------------------------------------------------
  * Send 8 bits and look for an acknowledgement.
  */
@@ -246,6 +242,7 @@ 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 +257,6 @@ int i2c_set_bus_speed(unsigned int speed)
 
 	return 0;
 }
-#endif
 
 /*-----------------------------------------------------------------------
  * if ack == I2C_ACK, ACK the byte so can continue reading, else