MAINTAINERS: sfc: remove Martin Habets

Martin has left AMD and no longer works on the sfc driver.

Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Link: https://patch.msgid.link/20250307154731.211368-1-edward.cree@amd.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>