UPSTREAM: ARM: dts: rockchip: move rk3036 memory definition to board files

UPSTREAM: ARM: dts: rockchip: move rk3036 memory definition to board files

The amount of available memory is clearly a board-specific value, so
the core per-soc dtsi should not define a default of any sort.
Therefore move the memory-nodes to the two board files.

Also fix the amount of memory on Kylin (512MB instead of 1GB).
While in most cases the bootloader will override this with the
actual amount of memory, there is no need to keep known wrong values
in the board-dts.

Change-Id: I01645bb5a371b75b3cd3e044200b303b24f3709e
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Caesar Wang <wxt@rock-chips.com>
(cherry picked from git.kernel.org next/linux-next.git master
 commit fbf15046f12d6c8d5821c0dc5bf3ffc55a132243)