media: dvb-frontends: remove unused drx_dap_fasi_funct_g declaration

drx_dap_fasi_funct_g has been removed since
commit 80bff4b0 ("[media] drx-j: get rid of struct
drx_dap_fasi_funct_g"), so remove it.

Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>