microblaze: Remove unused I2C macros

There is no i2c driver in the current u-boot.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

board/xilinx/microblaze-generic/xparameters.h

@@ -28,11 +28,6 @@
 #define XILINX_TIMER_BASEADDR	0x41c00000
 #define XILINX_TIMER_IRQ	0
 
-/* IIC pheriphery is IIC_EEPROM */
-#define XILINX_IIC_0_BASEADDR	0x40800000
-#define XILINX_IIC_0_FREQ	100000
-#define XILINX_IIC_0_BIT	0
-
 /* GPIO is LEDs_4Bit*/
 #define XILINX_GPIO_BASEADDR	0x40000000