target/openrisc: Remove 'TARGET_LONG_BITS != 32' dead code

target/openrisc: Remove 'TARGET_LONG_BITS != 32' dead code

The OpenRISC targets are only built as 32-bit:

  $ git grep TARGET_LONG_BITS configs/targets/or1k-*
  configs/targets/or1k-linux-user.mak:5:TARGET_LONG_BITS=32
  configs/targets/or1k-softmmu.mak:5:TARGET_LONG_BITS=32

Remove the dead code guarded within TARGET_LONG_BITS != 32.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20251010070702.51484-7-philmd@linaro.org>