perf sort: Remove hist_entry__sort_list() and sort__first_dimension() leftover declar...

perf sort: Remove hist_entry__sort_list() and sort__first_dimension() leftover declarations

The hist_entry__sort_list and sort__first_dimension functions have been
removed in commit cfaa154b2335d4c8 ("perf tools: Get rid of obsolete
hist_entry__sort_list"), remove them.

Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Athira Jajeev <atrajeev@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: https://lore.kernel.org/r/20220909044542.1087870-2-cuigaosheng1@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>