axi2tlm_bridge: compile error on Cadence Xcelium

[wilberZen]

Xcelium reports C++ type dismatch at code:

// file: axi2tlm-bridge.h  line:413

			for (; i < DATA_BUS_BYTES && m_dataIdx < m_gp->get_data_length(); i++) {
				if (wstrb.read().bit(i)) {
					............
			}

changed to :

			for (; i < DATA_BUS_BYTES && m_dataIdx < m_gp->get_data_length(); i++) {
				if (wstrb.read().bit(i).to_bool()) {
					.............
			}