MAINTAINERS: platform-chrome: Add new chrome-platform@lists.linux.dev list

Chrome Platform now has a mailing list.

Signed-off-by: Benson Leung <bleung@chromium.org>
Reviewed-by: Prashant Malani <pmalani@chromium.org>
Link: https://lore.kernel.org/r/20220126222233.2852280-1-bleung@chromium.org