gpu: nvgpu: Disable big pages for dGPUs

Big pages are not supported by all dGPUs on sysmem. Disable support
for all dGPUs for now.

Change-Id: I7bdcd9b18845c3d32d40e33220bf9afaf2d8c28e
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/1150547
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Konsta Holtta <kholtta@nvidia.com>

drivers/gpu/nvgpu/pci.c

@@ -63,6 +63,7 @@ static struct gk20a_platform nvgpu_pci_device = {
 	.default_big_page_size	= SZ_64K,
 
 	.ch_wdt_timeout_ms = 7000,
+	.disable_bigpage = true,
 };
 
 static struct pci_device_id nvgpu_pci_table[] = {