V4L/DVB (5772): Cx88: remove two unused pointers from struct cx8802_dev

The following two pointers in struct cx8802_dev are unused - remove them:

void* fe_handle;
int   (*fe_release)(void *handle);

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>