drm/{i915,xe}/panic: rename intel_bo_panic_*() to intel_panic_*()

Rename the intel_bo_panic_*() functions according to the functionality,
dropping the misleading intel_bo reference.

Keep intel_bo_alloc_framebuffer() for now; it'll be refactored later.

Cc: Jocelyn Falempe <jfalempe@redhat.com>
Cc: Maarten Lankhorst <dev@lankhorst.se>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://lore.kernel.org/r/a3be8f8b5e7dd208027a1131e89452d9a214054f.1756835342.git.jani.nikula@intel.com