Staging: bcm: Remove typedef for _BCM_INTERFACE_TYPE and reference directly.

This patch removes typedef for _BCM_INTERFACE_TYPE,
and changes the name of the enum to bcm_interface_type.
In addition, any calls to typedefs BCM_INTERFACE_TYPE
are changed to reference the enum directly.

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