Add am_cpu to arc-bugreport

Add am_cpu similar to am_pss and am_meminfo

Bug: 293066797
Bug: 314845123
Test: Manual testing

Change-Id: I57ad21859111b6d81a86074b8fa6957683ec5375
(cherry picked from commit 607939308c5a7c67be1dc85be0e354db1a5b259a)
2 files changed