drm/xe/vf: Rebase HWSP of all contexts after migration

drm/xe/vf: Rebase HWSP of all contexts after migration

All contexts require an update due to GGTT range shift, as that
affects their HWSP.

The HW status page of a context contains GGTT references, which
need to be shifted to a new range (or re-computed using the
previously updated vma nodes). The references include ring start
address and indirect state address.

v2: move some functions to better matched files
v3: Add missing kerneldocs
v4: Style fix

Signed-off-by: Tomasz Lis <tomasz.lis@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Michal Winiarski <michal.winiarski@intel.com>
Acked-by: Satyanarayana K V P <satyanarayana.k.v.p@intel.com>
Reviewed-by: Michal Winiarski <michal.winiarski@intel.com>
Link: https://lore.kernel.org/r/20250802031045.1127138-5-tomasz.lis@intel.com
Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>