MAINTAINERS: Add an entry for ChipIdea USB driver

Now that the ChipIdea driver and related platform code has its own
location in the kernel and more contributions from the interested
parties are anticipated, add a new maintainer for it.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>