Fix memory leak in dfs module by removing check for the board id.
During dfs_attach dfs_hw_bd_id was zero, so memory was allocated for
pulses_ext_seg but in wma registration process correct board was
updated. In dfs_detach while freeing the memory we check for the
board id and we leaked the memory for pulses_ext_seg.
Change-Id: Ica9719cc4cd67e895fad850c59c753d39473f46d
CRs-Fixed: 974299
0379b59f95