configs: Increase USB Hub debounce timeout in Agilex5

Some legacy USB mass storage devices during connection were
observed to have debounce issues. Hence, increasing the default
USB Hub debounce timeout value to handle this issue for devices
connected to Agilex5 boards.

Signed-off-by: Naresh Kumar Ravulapalli <nareshkumar.ravulapalli@altera.com>
Reviewed-by: Tien Fong Chee <tien.fong.chee@altera.com>