i2c: Added Kconfig support for CONFIG_ZYNQ_GEM_I2C_MAC_OFFSET

This patch added Kconfig support for CONFIG_ZYNQ_GEM_I2C_MAC_OFFSET
and enabled it in respective defconfig.

Signed-off-by: Vipul Kumar <vipulk@xilinx.com>
Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index f1c15cb..d774569 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -214,6 +214,12 @@
 	  This option is an SPL-variant of the I2C_EEPROM option.
 	  See the help of I2C_EEPROM for details.
 
+config ZYNQ_GEM_I2C_MAC_OFFSET
+	hex "Set the I2C MAC offset"
+	default 0x0
+	help
+	  Set the MAC offset for i2C.
+
 if I2C_EEPROM
 
 config SYS_I2C_EEPROM_ADDR