remove Dan Murphy from TI from MAINTAINERS

Dan's address bounces, and has been bouncing for some time as he moved
to other projects.

I believe TI should be more careful with this, and should assign
alternate contacts for their drivers.

Anyway what we can do now is to remove the obsolete address.

Signed-off-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>