Recursive systematic convolutional code (RSC) realization in MATLAB
The question is already answered but let me structure it for future readers.
From the MATLAB help for the function poly2trellis, here is how you can do it:

TRELLIS = poly2trellis(CONSTRAINTLENGTH, CODEGENERATOR, FEEDBACKCONNECTION)

Hence for the figure in the question:
 RSC_trellis = poly2trellis( 3, [7 5], 7);

Or, for the other possible RSC encoder, i.e. choosing the lower branch to be fedback:
 RSC_trellis = poly2trellis( 3, [7 5], 5);