populate_sdk_base: also record the host part into manifest

populate_sdk_base: also record the host part into manifest

For now, we can create manifest for the target part for SDK.
I think it's nice to have a place for users to look into to examine contents
of the host part of SDK.

This also affects uninative-tarball and buildtools-tarball as they
inherit populate_sdk.bbclass. After this change, we could have a manifest file
created in the deploy directory containing a list of packages used to
construct them.

[YOCTO #7604]

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>