powerpc: Remove T command from xmon help text since it no longer exists

Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index d0623e0..1124f11 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -210,7 +210,6 @@
   s	single step\n\
   S	print special registers\n\
   t	print backtrace\n\
-  T	Enable/Disable PPCDBG flags\n\
   x	exit monitor and recover\n\
   X	exit monitor and dont recover\n"
 #ifdef CONFIG_PPC64