MAINTAINERS: Remove Toshiba Linux mailing list address

As of March 31th 2015, the mailing-list service finished [1].

This patch simply removes such address.

[1] http://goo.gl/F6jS5r



Signed-off-by: Azael Avalos <coproscefalo@gmail.com>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>