mailmap: update Matt Ranostay email address

Set current email address to replace previous employers email addresses.

Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Daniel Baluta <daniel.baluta@intel.com>
Cc: linux-iio@vger.kernel.org
Signed-off-by: Matt Ranostay <mranostay@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>