media: lmedm04: delete lme2510_get_adapter_count()

The adapter count is fixed at compile time so we can delete the
lme2510_get_adapter_count() function and set ".num_adapters = 1"
instead.  There is also no need to create a zeroed adapter
element at the end of the array.  Remove that as well.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>