MAINTAINERS: update linux-can git repositories
MAINTAINERS: update linux-can git repositories

The linux-can upstream git repositories are now hosted on kernel.org, update
MAINTAINERS accordingly.

Signed-off-by: Marc Kleine-Budde <4a0ea1158d3cc63151119c05b1bff00c0bdbf421@pengutronix.de>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs