It looks like almost any design using both of these is also likely to have a 1.8V supply as well as these two Vcore supplies.
You might be able to get by just starting from the 1.8V supply, and putting a diode in series with each of these.
A diode has a forward drop of about 0.65 volts, which varies (ever so slightly) with the current being drawn. So, starting from 1.8V and a nominal 0.65 volt drop, each of them is at 1.15 volts--(just barely) within spec for both.
Since the 7206 draws more current, it'd see a slightly greater drop across the diode, bringing its supply voltage closer to its nominal 1.1 (while the CX3 drawing a bit less would probably maintain at least 1.15 all the time).
If you wanted to do this more accurately, you could use Schottky diodes, which are normally rated for more specific forward voltage drops. Getting one rated for a 0.6 V drop, and the other for a 0.7 V drop would put each of them at rated voltage (and still let you use one regulator instead of 2 or 3).