arm: mvebu: Remove leftover Makefile

This Makefile was not used since quite some time. I only missed to
remove it in the move to mach-mvebu. So lets remove it now so
that the mvebu-common directory is really removed completely.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Luka Perkov <luka.perkov@sartura.hr>

arch/arm/mvebu-common/Makefile

-#
-# (C) Copyright 2009
-# Marvell Semiconductor <www.marvell.com>
-# Written-by: Prafulla Wadaskar <prafulla@marvell.com>
-#
-# SPDX-License-Identifier:	GPL-2.0+
-#
-
-obj-y	= dram.o
-obj-y	+= gpio.o
-obj-$(CONFIG_ARMADA_XP) += mbus.o
-obj-y	+= timer.o
-
-obj-y	+= serdes/