rename CFG_ macros to CONFIG_SYS

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/doc/I2C_Edge_Conditions b/doc/I2C_Edge_Conditions
index 44d3478..f4a9968 100644
--- a/doc/I2C_Edge_Conditions
+++ b/doc/I2C_Edge_Conditions
@@ -33,7 +33,7 @@
 This reset edge condition could possibly be present in every I2C
 controller and device available. For boards where a I2C bus reset
 function can be implemented a i2c_init_board() function should be
-provided and enabled by #define'ing CFG_I2C_INIT_BOARD in your
+provided and enabled by #define'ing CONFIG_SYS_I2C_INIT_BOARD in your
 board's config file. Note that this is NOT necessary when using the
 bit-banging I2C driver (common/soft_i2c.c) as this already includes
 the I2C bus reset sequence.