staging: vt6655: remove typedef enum __device_init_type

The value is either DEVICE_INIT_COLD or DEVICE_INIT_DXPL making no
difference to code.

Remove typedef and remove if statement in device_init_registers
pulling the code in.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>