Staging: bcm: Remove typedef for _TCP_HEADER and call directly.

This patch removes typedef for _TCP_HEADER, and changes
the name of the struct to bcm_tcp_header. In addition,
any calls to struct "TCP_HEADER, or *PTCP_HEADER" are
changed to call directly.

Signed-off-by: Kevin McKinney <klmckinney1@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>