perf build: Remove Makefile.syscalls

Now a single beauty file is generated and used by all architectures,
remove the per-architecture Makefiles, Kbuild files and previous
generator script.

Note: th

perf build: Remove Makefile.syscalls

Now a single beauty file is generated and used by all architectures,
remove the per-architecture Makefiles, Kbuild files and previous
generator script.

Note: there was conversation with Charlie Jenkins
<[email protected]> and they'd written an alternate approach to
support multiple architectures:
https://lore.kernel.org/all/20250114-perf_syscall_arch_runtime-v1-1-5b304e408e11@rivosinc.com/
It would have been better to have helped Charlie fix their series (my
apologies) but they agreed that the approach taken here was likely
best for longer term maintainability:
https://lore.kernel.org/lkml/Z6Jk_UN9i69QGqUj@ghost/

Signed-off-by: Ian Rogers <[email protected]>
Reviewed-by: Howard Chu <[email protected]>
Reviewed-by: Charlie Jenkins <[email protected]>
Reviewed-by: Namhyung Kim <[email protected]>
Acked-by: Arnaldo Carvalho de Melo <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Namhyung Kim <[email protected]>

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