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/configs/zynq_zybo_defconfig b/configs/zynq_zybo_defconfig
index 57b39a2..202bf72 100644
--- a/configs/zynq_zybo_defconfig
+++ b/configs/zynq_zybo_defconfig
@@ -41,6 +41,7 @@
 CONFIG_FPGA_ZYNQPL=y
 CONFIG_DM_GPIO=y
 CONFIG_SYS_I2C_ZYNQ=y
+CONFIG_ZYNQ_GEM_I2C_MAC_OFFSET=0xFA
 CONFIG_MMC_SDHCI=y
 CONFIG_MMC_SDHCI_ZYNQ=y
 CONFIG_SPI_FLASH=y