plat: rcar: Use array in the DRAM size reporting

Use array of start-size tuples for the DRAM banks and call single
function which iterates over this array to report the DRAM info.
This is in preparation for expanding this to generate FDT for the
next stage.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
1 file changed