PLL power supply filtering
The PLL is sensitive to noise on its power input pin in a way that the core really is not (The PLL is essentially analogue at least as far as the VCO and squarer are concerned, so ANY noise will impact the performance), the core just needs the supply to stay within an acceptable range. 

The 10uH and caps form a filter to massively reduce the high frequency noise at the PLL pin. 

The resistor serves to damp the resonance of the 10uH inductor and the caps on the pll pin which could otherwise actually increase the noise level at some frequencies, you do NOT want too much Q here.