MAINTAINERS: Change Solarflare maintainers

Email from solarflare.com will stop working. Update the maintainers.
A replacement for [email protected] is not working yet,
for now remove it.

Signed-off-by: Martin Habets <[email protected]>
Signed-off-by: Edward Cree <[email protected]>
Link: https://lore.kernel.org/r/20201120113207.GA1605547@mh-desktop
Signed-off-by: Jakub Kicinski <[email protected]>

MAINTAINERS

@@ -15775,9 +15775,8 @@ F:	drivers/slimbus/
 F:	include/linux/slimbus.h
 
 SFC NETWORK DRIVER
-M:	Solarflare linux maintainers <[email protected]>
-M:	Edward Cree <[email protected]>
-M:	Martin Habets <[email protected]>
+M:	Edward Cree <[email protected]>
+M:	Martin Habets <[email protected]>
 L:	[email protected]
 S:	Supported
 F:	drivers/net/ethernet/sfc/