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

This patch removes typedef for wrmbuffer, and
changes the name of the struct to bcm_wrm_buffer.
In addition, any calls to typedefs WRM_BUFFER, or
*PWRM_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>