arm: mmp: Make all the dts file to be compiled by Makefile

Add items in arch/arm/boot/dt/Makefile to compile the dtb
for mach-mmp.
Change the dts and dtsi file to use #include instead of \include\

Signed-off-by: Chao Xie <chao.xie@marvell.com>
Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com>
Signed-off-by: Michael Turquette <mturquette@linaro.org>