mm/damon/core: receive addr_unit on damon_set_region_biggest_system_ram_default()

mm/damon/core: receive addr_unit on damon_set_region_biggest_system_ram_default()

damon_find_biggest_system_ram() was not supporting addr_unit in the past.
Hence, its caller, damon_set_region_biggest_system_ram_default(), was also
not supporting addr_unit.  The previous commit has updated the inner
function to support addr_unit.  There is no more reason to not support
addr_unit on damon_set_region_biggest_system_ram_default().  Rather, it
makes unnecessary inconsistency on support of addr_unit.  Update it to
receive addr_unit and handle it inside.

Link: https://lkml.kernel.org/r/20260311052927.93921-4-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Yang yingliang <yangyingliang@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>