image.bbclass: don't export PACKAGE_INSTALL
image.bbclass: don't export PACKAGE_INSTALL

It doesn't need to be exported, as the rootfs classes use the bitbake variable
directly, not the shell variable created from it.

Signed-off-by: Chris Larson <4c8c411260e601995081b113a5ef94a26eff2b25@mentor.com>

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