MAINTAINERS: eth: mvneta: move Thomas to CREDITS

Thomas is still active in other bits of the kernel and beyond
but not as much on the Marvell Ethernet devices.
Our scripts report:

Subsystem MARVELL MVNETA ETHERNET DRIVER
  Changes 54 / 176 (30%)
  (No activity)
  Top reviewers:
    [12]: hawk@kernel.org
    [9]: toke@redhat.com
    [9]: john.fastabend@gmail.com
  INACTIVE MAINTAINER Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Acked-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Link: https://lore.kernel.org/r/20240109164517.3063131-4-kuba@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

CREDITS

@@ -3049,6 +3049,10 @@ S: Demonstratsii 8-382
 S: Tula 300000
 S: Russia
 
+N: Thomas Petazzoni
+E: thomas.petazzoni@bootlin.com
+D: Driver for the Marvell Armada 370/XP network unit.
+
 N: Gordon Peters
 E: GordPeters@smarttech.com
 D: Isochronous receive for IEEE 1394 driver (OHCI module).

MAINTAINERS

@@ -12875,9 +12875,8 @@ S:	Maintained
 F:	drivers/thermal/armada_thermal.c
 
 MARVELL MVNETA ETHERNET DRIVER
-M:	Thomas Petazzoni <thomas.petazzoni@bootlin.com>
 L:	netdev@vger.kernel.org
-S:	Maintained
+S:	Orphan
 F:	drivers/net/ethernet/marvell/mvneta.*
 
 MARVELL MVPP2 ETHERNET DRIVER