kernel.bbclass: Move away from calling package_get_auto_pr
...instead we call read_subpackage_metadata.
Calling package_get_auto_pr *should* result in the same PKGV AUTOINC
replacement. However, it will also end up changing PKGR differently
then do_package as the BB_TASKHASH used will be for the wrong task.
Generally this won't cause any real-world issue, but it could cause
problems.
Moving to read_subpackage_metadata ensures that the values used
in do_package will be read in and used for kernel deployment.
Signed-off-by: Mark Hatle <mark.hatle@kernel.crashing.org> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
