MAINTAINERS: Mark coretemp driver as orphaned

This maintainer's email no longer works. Remove it from MAINTAINERS.
Also mark the driver as Orphaned for now.

Signed-off-by: Dave Hansen <[e-mail]>
Cc: Jean Delvare <[e-mail]>
Cc: Guenter Roeck <[e-mail]>
Cc: [e-mail]
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Guenter Roeck <[e-mail]>

MAINTAINERS

···
 F:	tools/testing/selftests/cgroup/test_memcontrol.c
 
 CORETEMP HARDWARE MONITORING DRIVER
-M:	Fenghua Yu <[e-mail]>
 L:	[e-mail]
-S:	Maintained
+S:	Orphan
 F:	Documentation/hwmon/coretemp.rst
 F:	drivers/hwmon/coretemp.c