drm/xe/devcoredump: Fix print typo of offset

drm/xe/devcoredump: Fix print typo of offset

The log should print with "offset" instead of "size".
Correct the typo in the comment.

v2: split kzalloc change and add typo fix in commit message (Lucas)

Signed-off-by: Shuicheng Lin <shuicheng.lin@intel.com>
Cc: John Harrison <John.C.Harrison@Intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Tejas Upadhyay <tejas.upadhyay@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250220001710.1803749-2-shuicheng.lin@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>