Coverity: Do not specify tool version

The tool downloaded from https://scan.coverity.com/download/linux64 is
always the latest version. And the version number is included in the
folder name of the tool.

To avoid unexpected error of wrong path when the tool version got
updated, do not specify coverity tool version.

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: Ifcc6a9b0341538364a1f7fa1fcc7b97fb8720368
1 file changed