Mellanox driver has been upgraded to 4.5.1 version in tarball_dl.lst
Need update the name in populate_downloads.sh accordingly.
Story: 2004521
Task: 29193
Change-Id: If4cb097f9ee2027f2e7eb6436057cdd607890f81
Signed-off-by: Shuicheng Lin <shuicheng.lin@intel.com>