V4L/DVB (6667): Fix access to configuration space while in D3

pci_save_state should be called before pci_set_power_state
and pci_restore_state after pci_set_power_state

Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>