MAINTAINERS: mark Synopsys DW XPCS as Orphan

MAINTAINERS: mark Synopsys DW XPCS as Orphan

There's not much review support from Jose, there is a sharp
drop in his participation around 4 years ago.
The DW XPCS IP is very popular and the driver requires active
maintenance.

gitdm missingmaints says:

Subsystem SYNOPSYS DESIGNWARE ETHERNET XPCS DRIVER
  Changes 33 / 94 (35%)
  (No activity)
  Top reviewers:
    [16]: andrew@lunn.ch
    [12]: vladimir.oltean@nxp.com
    [2]: f.fainelli@gmail.com
  INACTIVE MAINTAINER Jose Abreu <Jose.Abreu@synopsys.com>

Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250108155242.2575530-2-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>