perf tools: Fix arm64 source package build

Syscall tables are generated from rules in the kernel tree. Add the
related files to the MANIFEST to fix the Perf source package build.

Reported-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Fixes: bfb713ea53 ("perf tools: Fix arm64 build by generating unistd_64.h")
Signed-off-by: James Clark <james.clark@linaro.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.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>
Link: https://lore.kernel.org/r/20250513-james-perf-src-pkg-fix-v1-1-bcfd0486dbd6@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/MANIFEST

@@ -1,8 +1,10 @@
 COPYING
 LICENSES/preferred/GPL-2.0
 arch/arm64/tools/gen-sysreg.awk
+arch/arm64/tools/syscall_64.tbl
 arch/arm64/tools/sysreg
 arch/*/include/uapi/asm/bpf_perf_event.h
+include/uapi/asm-generic/Kbuild
 tools/perf
 tools/arch
 tools/scripts
@@ -25,6 +27,10 @@ tools/lib/str_error_r.c
 tools/lib/vsprintf.c
 tools/lib/zalloc.c
 scripts/bpf_doc.py
+scripts/Kbuild.include
+scripts/Makefile.asm-headers
+scripts/syscall.tbl
+scripts/syscallhdr.sh
 tools/bpf/bpftool
 kernel/bpf/disasm.c
 kernel/bpf/disasm.h