ppc4xx: Fix lwmon5 compilation problem

Now that the 440EPx ECC test is not board specific anymore
remove this Makefile.

Signed-off-by: Stefan Roese <sr@denx.de>

post/board/lwmon5/Makefile

-#
-# (C) Copyright 2002-2007
-# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
-#
-# See file CREDITS for list of people who contributed to this
-# project.
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License as
-# published by the Free Software Foundation; either version 2 of
-# the License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
-# MA 02111-1307 USA
-#
-
-
-LIB	= libpostlwmon5.a
-
-COBJS	= ecc.o
-
-include $(TOPDIR)/post/rules.mk