local.conf.sample: drop oprofile from CORE_IMAGE_EXTRA_INSTALL

This package is already included by default via tools-profile. Of course, we
still need an example usage of CORE_IMAGE_EXTRA_INSTALL, so comment it out and
change the package to something else, I chose bash as a straightforward option
which is in oe-core.

JIRA: SB-3999

Signed-off-by: Christopher Larson <chris_larson@mentor.com>
local.conf.sample: update CORE_IMAGE_EXTRA_INSTALL comment

Signed-off-by: Christopher Larson <chris_larson@mentor.com>
Merge pull request #375 from kergoth/sb-3999

local.conf.sample: drop oprofile from CORE_IMAGE_EXTRA_INSTALL