MAINTAINERS: remove Koichi Yasutake

The MTA says:
 <yasutake.koichi@jp.panasonic.com>: unknown user:
    "yasutake.koichi@jp.panasonic.com"

Link: http://lkml.kernel.org/r/1462776755-9607-1-git-send-email-jslaby@suse.cz
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

MAINTAINERS

@@ -8378,7 +8378,6 @@ F:	drivers/platform/x86/panasonic-laptop.c
 
 PANASONIC MN10300/AM33/AM34 PORT
 M:	David Howells <dhowells@redhat.com>
-M:	Koichi Yasutake <yasutake.koichi@jp.panasonic.com>
 L:	linux-am33-list@redhat.com (moderated for non-subscribers)
 W:	ftp://ftp.redhat.com/pub/redhat/gnupro/AM33/
 S:	Maintained