disk/ doc/ lib_*/ and tools/: 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>
diff --git a/lib_ppc/kgdb.c b/lib_ppc/kgdb.c
index d272d3a..78c2f0c 100644
--- a/lib_ppc/kgdb.c
+++ b/lib_ppc/kgdb.c
@@ -323,4 +323,4 @@
 	    ");
 }
 
-#endif /* CFG_CMD_KGDB */
+#endif