drivers: of: add initialization code for dynamic reserved memory

This patch adds support for dynamically allocated reserved memory regions
declared in device tree. Such regions are defined by 'size', 'alignment'
and 'alloc-ranges' properties.

Based on previous code provided by Josh Cartwright <joshc@codeaurora.org>

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Grant Likely <grant.likely@linaro.org>

diff --cc drivers/of/Kconfig
Simple merge

diff --cc drivers/of/Makefile
Simple merge

diff --cc drivers/of/fdt.c
Simple merge

diff --cc drivers/of/of_reserved_mem.c
Simple merge

diff --cc include/linux/of_reserved_mem.h
Simple merge