drm/xe/vf: Rebase exec queue parallel commands during migration recovery

drm/xe/vf: Rebase exec queue parallel commands during migration recovery

Parallel exec queues have an additional command streamer buffer which holds
a GGTT reference to data within context status. The GGTT references have to
be fixed after VF migration.

v2: Properly handle nop entry, verify if parsing goes ok
v3: Improve error/warn logging, add propagation of errors,
 give names to magic offsets

Signed-off-by: Tomasz Lis <tomasz.lis@intel.com>
Cc: Michal Winiarski <michal.winiarski@intel.com>
Reviewed-by: Michał Winiarski <michal.winiarski@intel.com>
Link: https://lore.kernel.org/r/20250802031045.1127138-9-tomasz.lis@intel.com
Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>