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/northbridge/intel/pineview/gma.c

@@ -326,10 +326,7 @@ static struct device_operations gma_func0_ops = {
 	.read_resources         = pci_dev_read_resources,
 	.set_resources          = pci_dev_set_resources,
 	.enable_resources       = pci_dev_enable_resources,
-	.acpi_fill_ssdt		= NULL,
 	.init                   = gma_func0_init,
-	.scan_bus               = NULL,
-	.enable                 = NULL,
 	.ops_pci                = &gma_pci_ops,
 	.acpi_name              = gma_acpi_name,
 	.write_acpi_tables      = gma_write_acpi_tables,