drm/xe/devcoredump: Use drm_puts and already cached local variables

There are a bunch of calls to drm_printf with static strings. Switch
them to drm_puts instead.

There are also a bunch of 'coredump->snapshot.XXX' references when
'coredump->snapshot' has alread been cached locally as 'ss'. So use
'ss->XXX' instead.

Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Reviewed-by: Julia Filipchuk <julia.filipchuk@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241003004611.2323493-3-John.C.Harrison@Intel.com