board/mpl: Remove mpl-specific memory test command

The mpl-specfic memory test is only documented for one board, doesn't
compile cleanly, uses improper coding style, and overlaps functionality
with U-Boot's common 'mtest' command, so lets get rid of it.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
CC: d.peter@mpl.ch
CC: d.mueller@elsoft.ch
CC: wd@denx.de
diff --git a/board/mpl/mip405/Makefile b/board/mpl/mip405/Makefile
index 18a8d86..21e3cda 100644
--- a/board/mpl/mip405/Makefile
+++ b/board/mpl/mip405/Makefile
@@ -29,7 +29,7 @@
 LIB	= $(obj)lib$(BOARD).a
 
 COBJS	= $(BOARD).o ../common/flash.o cmd_mip405.o ../common/pci.o \
-			../common/usb_uhci.o ../common/memtst.o ../common/common_util.o
+			../common/usb_uhci.o ../common/common_util.o
 
 SOBJS	= init.o