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[uvm_reg] update "W1C" could cause problem.

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I am not sure if it is a known issue or not. FYI and thanks!

the problem is the upd could be wrong when XupdateX returns vaule 0xffffffff (~0) when access = W1C.

in uvm_reg::update function

foreach (m_fields[i] )
  upd |= m_fields[i].XupdateX() << m_fields[i].get_lsb_pos();

in uvm_reg_field::XupdateX()

case (m_access)
  "W1C": XupdateX = ~m_desired;
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