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

This patch removes typedef for bulkwrmbuffer,
and changes the name of the struct to
bcm_bulk_wrm_buffer. In addition, any calls to
typedefs BULKWRM_BUFFER, or *PBULKWRM_BUFFER
are changed to call the struct directly.

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