Configs: Migrate I2C_BUS_MAX to CONFIG_SYS_I2C_BUS_MAX

For consistency with other platforms and in preparation of Kconfig
migration, let's change Several TI platforms that use I2C_BUS_MAX
to CONFIG_SYS_I2C_BUS_MAX

Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/drivers/i2c/davinci_i2c.c b/drivers/i2c/davinci_i2c.c
index 2df07bb..a35ec46 100644
--- a/drivers/i2c/davinci_i2c.c
+++ b/drivers/i2c/davinci_i2c.c
@@ -343,11 +343,11 @@
 static struct i2c_regs *davinci_get_base(struct i2c_adapter *adap)
 {
 	switch (adap->hwadapnr) {
-#if I2C_BUS_MAX >= 3
+#if CONFIG_SYS_I2C_BUS_MAX >= 3
 	case 2:
 		return (struct i2c_regs *)I2C2_BASE;
 #endif
-#if I2C_BUS_MAX >= 2
+#if CONFIG_SYS_I2C_BUS_MAX >= 2
 	case 1:
 		return (struct i2c_regs *)I2C1_BASE;
 #endif
@@ -412,7 +412,7 @@
 			 CONFIG_SYS_DAVINCI_I2C_SLAVE,
 			 0)
 
-#if I2C_BUS_MAX >= 2
+#if CONFIG_SYS_I2C_BUS_MAX >= 2
 U_BOOT_I2C_ADAP_COMPLETE(davinci_1, davinci_i2c_init, davinci_i2c_probe_chip,
 			 davinci_i2c_read, davinci_i2c_write,
 			 davinci_i2c_setspeed,
@@ -421,7 +421,7 @@
 			 1)
 #endif
 
-#if I2C_BUS_MAX >= 3
+#if CONFIG_SYS_I2C_BUS_MAX >= 3
 U_BOOT_I2C_ADAP_COMPLETE(davinci_2, davinci_i2c_init, davinci_i2c_probe_chip,
 			 davinci_i2c_read, davinci_i2c_write,
 			 davinci_i2c_setspeed,