dtc: Update TODO files

This patch makes a bunch of updates to the TODO files for dtc and
libfdt, some of them rather overdue.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

TODO

@@ -1,14 +1,8 @@
 - Bugfixes:
 	* Proper handling of boot cpu information
-- Error handling / reporting
-	* Better categorization of errors into severity levels
-	* Don't stop checking for later errors because of earlier ones
-	  whenever possible
 - Generate mem reserve map
 	* linux,reserve-map property
 	* generating reserve entry for device tree itself
 	* generating reserve entries from tce, rtas etc. properties
-
-
-- Testsuite
-- Actually number releases, all that kind of jazz
+- Expression support
+- Macro system

libfdt/TODO

@@ -1,5 +1,3 @@
-- Find node by linux,phandle property
 - Tree traversal functions
 - Graft function
-- Merge into dtc
-- Make fdt_open_into() re-arrange properly
+- Complete libfdt.h documenting comments