Staging: bcm: Remove typedef for IPV6FragmentHeaderFormatTag and call directly.

This patch removes typedef IPV6FragmentHeaderFormatTag,
and changes the name of the struct to bcm_ipv6_fragment_hdr.
In addition, any calls to typedef IPV6FragmentHeader
are changed to call the struct directly.

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