perf trace: Use strtoul for the fcntl 'cmd' argument

Since its values are in two ranges of values we ended up codifying it
using a 'struct strarrays', so now hook it up with STUL_STRARRAYS so
that we can do:

  # perf trace -e syscalls:*enter_fcntl --filter=cmd==SETLK||cmd==SETLKW
     0.000 sssd_kcm/19021 syscalls:sys_enter_fcntl(fd: 13</var/lib/sss/secrets/secrets.ldb>, cmd: SETLK, arg: 0x7ffcf0a4dee0)
     1.523 sssd_kcm/19021 syscalls:sys_enter_fcntl(fd: 13</var/lib/sss/secrets/secrets.ldb>, cmd: SETLK, arg: 0x7ffcf0a4de90)
     1.629 sssd_kcm/19021 syscalls:sys_enter_fcntl(fd: 13</var/lib/sss/secrets/secrets.ldb>, cmd: SETLK, arg: 0x7ffcf0a4de90)
     2.711 sssd_kcm/19021 syscalls:sys_enter_fcntl(fd: 13</var/lib/sss/secrets/secrets.ldb>, cmd: SETLK, arg: 0x7ffcf0a4de70)
  ^C#

Cc: Adrian Hunter <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Brendan Gregg <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Luis Cláudio Gonçalves <[email protected]>
Cc: Namhyung Kim <[email protected]>
Link: https://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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