FROMLIST: memblock: track memblock changed at early param

In addition to reserved-memory in device tree, an option in cmdline may
result in memblock allocation. This patch tries to distinguish memblock
changes done at early param.

A region in memsize will be created with name as the param string. And
the region size will be updated during the param function.

Bug: 340432773
Signed-off-by: Jaewon Kim <jaewon31.kim@samsung.com>
Link: https://lore.kernel.org/linux-mm/20240521023957.2587005-6-jaewon31.kim@samsung.com/
Change-Id: Ib01e88b303be4ab958db46f1e369d15042a5d9fd