feature-removal-schedule.txt: Add CONFIG_SYS_MTEST_START/END

With 'mtest' no longer a default command, we will have unused defines
which should be removed for the v2013.10 release.

Signed-off-by: Tom Rini <trini@ti.com>

doc/feature-removal-schedule.txt

@@ -7,6 +7,18 @@ file.
 
 ---------------------------
 
+What:	Remove unused CONFIG_SYS_MEMTEST_START/END
+When:	Release v2013.10
+
+Why:	As the 'mtest' command is no longer default, a number of platforms
+	have not opted to turn the command back on and thus provide unused
+	defines (which are likely to be propogated to new platforms from
+	copy/paste).  Remove these defines when unused.
+
+Who:	Tom Rini <trini@ti.com>
+
+---------------------------
+
 What:	Remove CONFIG_SYS_ENABLE_PADS_ALL and CONFIG_SYS_CLOCKS_ENABLE_ALL
 When:	Release v2013.07