common/: Remove lingering references to CFG_CMD_* symbols.

Fixed some broken instances of "#ifdef CMD_CFG_IDE" too.
Those always evaluated TRUE, and thus were always compiled
even when IDE really wasn't defined/wanted.

Signed-off-by: Jon Loeliger <jdl@freescale.com>

common/command.c

@@ -76,7 +76,7 @@ U_BOOT_CMD(
 	"    - echo args to console; \\c suppresses newline\n"
 );
 
-#endif	/*  CFG_CMD_ECHO */
+#endif
 
 #ifdef CFG_HUSH_PARSER