staging: spectra: move all init logic into nand_pci_probe

Currently there are some driver initialization logic that
is not part of nand_pci_probe function. This will result in
that part of driver initialization code executing even on
platforms without the corresponding hardware which is always
dangerous.

Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.com>
Signed-off-by: Yong Wang <yong.y.wang@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>