media: aspeed: Use v4l2_dbg to replace v4l2_warn to avoid log spam

If the host is powered off, there will be many warning log. To avoid the
log spam in this condition, replace v4l2_warn with v4l2_dbg.

(cherry picked from commit def4d25856b2fa41c1c1390f1e8d1b027166f5e9)

OpenBMC-Staging-Count: 1
Signed-off-by: Jammy Huang <jammy_huang@aspeedtech.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Link: https://lore.kernel.org/r/20230211032235.20220-1-zev@bewilderbeest.net
Signed-off-by: Joel Stanley <joel@jms.id.au>
1 file changed