powerpc/pseries/vas: Enable NX-GZIP support with DLPAR and LPM operations

Description: Enable NX-GZIP support with DLPAR and LPM operations. On powerVM, the hypervisor defines the total number of available widows which depends on number of cores configured on the partition. So with the DLPAR operations, number of windows can be changed whether can be increased in the case of adding cores or can be decreased for removing cores. This feature adds changes in VAS/NXGZIP code to support DLPAR operations.

For LPM operation, all used VAS windows have to be closed before starting the migration and reopened on the destination LPAR after migration. This feature should add changes to support LPAR operations.

Bugzilla: http://bugzilla.redhat.com/2028677

Build Info: Built locally, since brewbuilding currently has an issue

Tested: Successfully tested by IBM. Sanity boot tested on power 9 (ibm-p9z-06-lp10) system.

Signed-off-by: Steve Best sbest@redhat.com