mm/cma: add 'available count' and 'total count' to trace_cma_alloc_start

mm/cma: add 'available count' and 'total count' to trace_cma_alloc_start

This makes cma info more intuitive during debugging.

Show up in the trace as:

	279.814717: cma_alloc_start: name=reserved request_count=4 available_count=8096 total_count=8192 align=0
	309.790580: cma_alloc_start: name=reserved request_count=4 available_count=8092 total_count=8192 align=0
	317.046609: cma_alloc_start: name=reserved request_count=4 available_count=8088 total_count=8192 align=0

Link: https://lkml.kernel.org/r/8a79284879c529f467478552825154b018076e95.1755729178.git.gaoxiang17@xiaomi.com
Signed-off-by: gaoxiang17 <gaoxiang17@xiaomi.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>