staging: dgap: move unrelated functions in dgap_firmware_load()

The dgap_firmware_load() has a lot of stuff which are
unrelated with loading firmware.
So just moved to dgap_init_one().

Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>