HID: moving to group maintainership model

Benjamin and myself will from now on be sharing maintainership
responsibilities for hid.git.

Update maintainers to reflect that change, and also move a git
repository to shared space at kernel.org.

Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>