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 <[e-mail]>
Fixes: bfb713ea53c746b0 ("perf tools: Fix arm64 build by generating unistd_64.h")
Signed-off-by: James Clark <[e-mail]>
Tested-by: Arnaldo Carvalho de Melo <[e-mail]>
Cc: Adrian Hunter <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Ian Rogers <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/MANIFEST

···
 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
···
 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