rename CFG_ macros to CONFIG_SYS

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/doc/README.MPC866 b/doc/README.MPC866
index c8256a1..4707cb7 100644
--- a/doc/README.MPC866
+++ b/doc/README.MPC866
@@ -4,8 +4,8 @@
 Four compile-time constants are used:
 
 	CONFIG_8xx_OSCLK          - input quartz clock
-	CFG_8xx_CPUCLK_MIN        - minimum allowed CPU clock
-	CFG_8xx_CPUCLK_MAX        - maximum allowed CPU clock
+	CONFIG_SYS_8xx_CPUCLK_MIN        - minimum allowed CPU clock
+	CONFIG_SYS_8xx_CPUCLK_MAX        - maximum allowed CPU clock
 	CONFIG_8xx_CPUCLK_DEFAULT - default CPU clock value
 
 If the "cpuclk" environment variable value is within the CPUCLK_MIN /