openldap: use PN for PACKAGES_DYNAMIC

Fixed do_packagedata error when multilib:
ERROR: The recipe openldap is trying to install files into a shared area when those files already exist. Those files and their manifest location are:
   /path/to/sysroots/qemux86-64/pkgdata/runtime-rprovides/openldap-backends/openldap-backends
   Matched in manifest-qemux86-64-lib32-openldap.packagedata
   /path/to/tmp/sysroots/qemux86-64/pkgdata/runtime/openldap-backends.packaged
   Matched in manifest-qemux86-64-lib32-openldap.packagedata
   /path/to/tmp/sysroots/qemux86-64/pkgdata/runtime/openldap-backends
   Matched in manifest-qemux86-64-lib32-openldap.packagedata
Please verify which recipe should provide the above files.

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>