qa.py: Toolchain path should not be hardcoded to execute objdump
Currently objdump command is invoked from the STAGING_BINDIR_TOOLCHAIN
directory. In case of external toolchain if this directory doesn't
exist then objdump fails to execute. Instead of hardcoding the path
it should search PATH to find it.
Signed-off-by: Christopher Larson <chris_larson@mentor.com> Signed-off-by: Muhammad Shakeel <muhammad_shakeel@mentor.com> Signed-off-by: Saul Wold <sgw@linux.intel.com>
