Indicate the list of taboo channels in this MoCA network represented as a bitmask. This value is derived from TABOO_MASK_START and TABOO_CHANNEL_MASK in the beacon, but has a different data representation. E.g. If taboo channels consists of 1300, 1350 and 1400 MHz, TABOO_MASK_START is 52, TABOO_CHANNEL_MASK is 'A8000000'h, and 'mocaIfTabooChannelMask' is '01500000'h. Note that in 'mocaIfTabooChannelMask', the lowest represented frequency of 800 MHz is represented in bit 0, and increasing bit position represents increasingly higher frequency. While in TABOO_CHANNEL_MASK, the taboo channel with the lowest frequency is represented in bit 31, and decreasing bit position represents increasingly higher frequency. If this interface is not sending or receiving beacon, or there is no taboo channel in this MoCA network, report a value of '0'.