i2c: Added Kconfig support for CONFIG_SYS_I2C_ZYNQ_SPEED

This patch added Kconfig support for CONFIG_SYS_I2C_ZYNQ_SPEED
and set it to default value 100000.

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/i2c/Kconfig b/drivers/i2c/Kconfig
index 6200f1c..6843131 100644
--- a/drivers/i2c/Kconfig
+++ b/drivers/i2c/Kconfig
@@ -281,6 +281,13 @@
 	help
 	  Set CONFIG_SYS_I2C_ZYNQ_SLAVE for slave addr.
 
+config SYS_I2C_ZYNQ_SPEED
+	int "Set I2C speed"
+	depends on SYS_I2C_ZYNQ
+	default 100000
+	help
+	  Set CONFIG_SYS_I2C_ZYNQ_SPEED for speed setting.
+
 config SYS_I2C_IHS
         bool "gdsys IHS I2C driver"
         depends on DM_I2C