Add IPA statistics to bugreport

So far, It's hard to capture the IPA related debug info
when issue happen because user need run adb command (cat /sys/kernel/debug/ipa/*)
to trigger IPA dump the debug message.
So add IPA statistics to bugreport for IPA related issues.

Bug: 137722545
Test: 1. Build pass in Forrest Run http://go/ab/P10659242
      2. Capture Bugreport and check ipa_statistics_msg log
Change-Id: Idb86a86ed3247dd87193be03144d9a174e5d31a5