UPSTREAM: mm/damon/vaddr: use pr_debug() for damon_va_three_regions() failure logging

Failure of 'damon_va_three_regions()' is logged using 'pr_err()'.  But,
the function can fail in legal situations.  To avoid making users be
surprised and to keep the kernel clean, this makes the log to be printed
using 'pr_debug()'.

Link: https://lkml.kernel.org/r/20211229131016.23641-3-sj@kernel.org


Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

(cherry picked from commit 251403f1)

Bug: 228223814
Signed-off-by: Hailong Tu <tuhailong@oppo.com>
Change-Id: I0a2c08d856d0067af6af7a008e89f63fa5fac381