Update libopencm3 and add Random Number Generator (RNG) (#2192)

* Compilation fixes (CAN bus)

* Update libopencm3

* Compilation fixes

* Added Random Number Generator for stm32 autopilots

* Compilation fixes

conf/airframes/AGGIEAIR/aggieair_ark_hexa_1-8.xml

@@ -56,6 +56,7 @@ Aggie Air ARK
 
   <modules>
     <module name="sys_mon"/>
+    <module name="rng"/>
     <module name="copilot"/>
     <module name="extra_dl">
       <!-- in order to use uart1 without chibios we need to remap the peripheral-->

conf/airframes/examples/quadrotor_lisa_mx.xml

@@ -53,6 +53,7 @@
     <module name="gps" type="ubx_ucenter"/>
     <module name="geo_mag"/>
     <module name="air_data"/>
+    <module name="rng"/>
   </modules>
 
   <servos driver="Pwm">