Fix EEG electrode positions in EDF/BDF import.

When importing EDF/BDF files, an optional .htps file can be supplied to
provide electrode coordinates. This commit fixes the way these are
stored in the .info dictionary, so that functions such as
make_eeg_layout can use them.
for some reason, make_eeg_layout does this:

    hsp = [info['chs'][ii]['eeg_loc'][:, 0] for ii in inds]

it expects the points to be a row matrix.