submodules: Update trappy to latest master
submodules: Update trappy to latest master

This brings
- Better error messages when attempting to parse absent or unknown
  events with trappy.stats.grammar
- A bug fix for parsing events with '=' in column fields

ARM-software/lisa,arnoldlu/lisa,ARM-software/lisa,mdigiorgio/lisa,mdigiorgio/lisa,credp/lisa,credp/lisa,bjackman/lisa,arnoldlu/lisa,credp/lisa,ARM-software/lisa,credp/lisa,ARM-software/lisa,bjackman/lisa