MAINTAINERS: Rakesh Iyer can't be reached anymore

The current mail address is rejected, last activity (with a different
address) in git-history is from 2012. Remove this.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>