ARM: fix "bad mode in ... handler" message for undefined instructions

commit 29c350b upstream.

The array was missing the final entry for the undefined instruction
exception handler; this commit adds it.

Change-Id: I3092e28e20cdacb7c4f42ea7084519b46ef4614d
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>