Upgrade coverity scan to version 2020.09

I have uploaded the tarball with the binaries to the TF-A static
server http://files.oss.arm.com/downloads/tf-a/

Also, there is no need to apply a patch that was put as a workaround
for an issue with earlier version of coverity scan(2019.03)

Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>
Change-Id: I6950482f6031fb915069106a91ede2720bbb5709
1 file changed