revised packet_header2 of gr-cdma

Dear Professor,

I've revised the packet_header2 of gr-cdma to keep only one tcm_type tag instead of previous two.  The cdma_tx_hier1 was also changed to make the header match the new packet_header2. And the 'tag' parameter of cdma_message probe was also changed accordingly in cdma_txrx1.

Could you check this?
When you approved these changes, I'll send you the updated cdma_parameters based on your comments. And the cdma_tx_her1 and cdma_rx_hier which are also revised to match the updates.

Thanks!
Best,
Zhe