target/arm: Use generic cpu_list()

target/arm: Use generic cpu_list()

No changes of the output from the following command before and
after it's applied.

[gshan@gshan q]$ ./build/qemu-system-aarch64 -cpu ?
Available CPUs:
  a64fx
  arm1026
  arm1136
  arm1136-r2
  arm1176
  arm11mpcore
  arm926
  arm946
  cortex-a15
  cortex-a35
  cortex-a53
  cortex-a55
  cortex-a57
  cortex-a7
  cortex-a710
  cortex-a72
  cortex-a76
  cortex-a8
  cortex-a9
  cortex-m0
  cortex-m3
  cortex-m33
  cortex-m4
  cortex-m55
  cortex-m7
  cortex-r5
  cortex-r52
  cortex-r5f
  max
  neoverse-n1
  neoverse-n2
  neoverse-v1
  pxa250
  pxa255
  pxa260
  pxa261
  pxa262
  pxa270-a0
  pxa270-a1
  pxa270
  pxa270-b0
  pxa270-b1
  pxa270-c0
  pxa270-c5
  sa1100
  sa1110
  ti925t

Signed-off-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20231114235628.534334-9-gshan@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>