Set fan speed to 40 jira:NONE Signed-off-by: xun.zhang <xun.zhang@bambulab.com> Change-Id: I861f78e2cca4b31daf41e2cba0a4b9b11a658a5d (cherry picked from commit 4a087ef78070af66d7551aacdca74c9a2d4463f2)