kmem/tracing: add kmem name to kmem_cache_alloc tracepoint

kmem/tracing: add kmem name to kmem_cache_alloc tracepoint

The kmem_cache_free tracepoint includes a "name" field, which allows for
easy identification and filtering of specific kmem's.  However, the
kmem_cache_alloc tracepoint lacks this field, making it difficult to pair
corresponding alloc and free events for analysis.

Add the "name" field to kmem_cache_alloc to enable consistent tracking and
correlation of kmem alloc and free events.

Link: https://lkml.kernel.org/r/20250825125927.59816-1-wander@redhat.com
Signed-off-by: Wander Lairson Costa <wander@redhat.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Martin Liu <liumartin@google.com>
Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>