MAINTAINERS: updates to IEEE 1394 subsystem maintainership

 - Stefan Richter snatches Jody's place
 - update path to linux1394.org's repo
 - remove now redundant entries of ohci1394 and sbp2
 - promote eth1394 from Orphaned to Odd Fixes
 - Stefan takes patches to pcilynx but doesn't have the hardware

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>