target/openrisc: Replace VMSTATE_UINTTL() -> VMSTATE_UINT32()

target/openrisc: Replace VMSTATE_UINTTL() -> VMSTATE_UINT32()

Both OpenRISCTLBEntry fields are of uint32_t type. Use the
appropriate VMSTATE_UINT32() macro.

There is no functional change (the migration stream is not
modified), because 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

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Anton Johansson <anjo@rev.ng>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20251010070702.51484-2-philmd@linaro.org>