Adjust PoE and change 3.3V supply topology

-Snubber circuit under ecrtail load condition can dissipate more power
then the resistor can handle, increased the resistor size and added one
more in parallel
-Increased size of some of the 12V input capacitors
-Use 3.3Vp instead of 3.3V generated by the RPi for LED, RTC, Radio, Fan
control and RPi reduced hat connector
-PoE pri/sec capacitor value changed

Signed-off-by: Dominik Sliwa <dominik@sliwa.io>

PCIe.kicad_sch

@@ -580,7 +580,6 @@
     )
   )
 
-
   (junction (at 152.4 35.56) (diameter 0.9144) (color 0 0 0 0)
     (uuid 360bedc1-8522-4c8c-bbbd-baca6d69d40e)
   )