i2c: S3C24X0: Finish Kconfig migration

Finish moving this driver to Kconfig.
- Update the dependency logic for Exynos5 too
- Remove the unused CONFIG_SYS_I2C_S3C24X0_SPEED variable
- Drop CONFIG_SYS_I2C_S3C24X0_SLAVE as it's always set to 0.
- Move the internal SYS_I2C_S3C24X0_SLAVE define closer to the only user.

Cc: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Minkyu Kang <mk7.kang@samsung.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
diff --git a/drivers/i2c/s3c24x0_i2c.c b/drivers/i2c/s3c24x0_i2c.c
index 56f0f69..e0f499d 100644
--- a/drivers/i2c/s3c24x0_i2c.c
+++ b/drivers/i2c/s3c24x0_i2c.c
@@ -21,12 +21,6 @@
 #include <i2c.h>
 #include "s3c24x0_i2c.h"
 
-#ifndef CONFIG_SYS_I2C_S3C24X0_SLAVE
-#define SYS_I2C_S3C24X0_SLAVE_ADDR	0
-#else
-#define SYS_I2C_S3C24X0_SLAVE_ADDR	CONFIG_SYS_I2C_S3C24X0_SLAVE
-#endif
-
 DECLARE_GLOBAL_DATA_PTR;
 
 /*
@@ -83,6 +77,8 @@
 	writel(I2C_MODE_MT | I2C_TXRX_ENA, &i2c->iicstat);
 }
 
+#define SYS_I2C_S3C24X0_SLAVE_ADDR	0
+
 static int s3c24x0_i2c_set_bus_speed(struct udevice *dev, unsigned int speed)
 {
 	struct s3c24x0_i2c_bus *i2c_bus = dev_get_priv(dev);