Demote HID polling debug message to verbose level

"Polling timed out" message is printed every 50ms, a source of spammy
log messages when a HID device is connected. Demote it to verbose
level.

Bug: 335065189
Test: m -j
Flag: EXEMPT, logging changes
Change-Id: I0c236f4e2f1602523b25a25c9ffcd5171746b33a