Drop explicit NULL initializations from device_operations

Unmentioned fields are initialized with 0 (or NULL) implicitly. Beside
that, the struct has grown over the years. There are too many optional
fields to list them all.

Change-Id: Icb9e14c58153d7c14817bcde148e86e977666e4b
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40126
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/drivers/intel/i210/i210.c

@@ -228,8 +228,6 @@ static struct device_operations i210_ops  = {
 	.set_resources    = set_resources,
 	.enable_resources = pci_dev_enable_resources,
 	.init             = init,
-	.scan_bus         = 0,
-	.ops_pci          = 0,
 };
 
 static const unsigned short i210_device_ids[] = { 0x1537, 0x1538, 0x1533, 0 };