Fix objdump command name in validation-report.py
Fix objdump command name in validation-report.py

This script was never updated after we changed the ARM toolchains we use.
It actually works fine, but only if it can find the right objdump.

BUG= none
TEST= ran it locally

R=jvoung@google.com

Review URL: https://chromiumcodereview.appspot.com/10407046

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@8652 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client