MAINTAINERS: remove Alessandro

I'm definitely not up to date on the subject matter any more
and haven't been able to comment on the messages on the topic.

Signed-off-by: Alessandro Rubini <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

MAINTAINERS

···
 S:	Maintained
 F:	drivers/mmc/host/imxmmc.*
 
-MOUSE AND MISC DEVICES [GENERAL]
-M:	Alessandro Rubini <[e-mail]>
-S:	Maintained
-F:	drivers/input/mouse/
-F:	include/linux/gpio_mouse.h
-
 MOXA SMARTIO/INDUSTIO/INTELLIO SERIAL CARD
 M:	Jiri Slaby <[e-mail]>
 S:	Maintained