Revert "arc: Add option for ARC-specific download site"
All packages use github now.
This reverts commit 1445b7fd2e46db5d39ad5e2f5cc262574399f5f3.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>