nvidia-driver: use http:// instead of ftp://

Fixes the download, which currently times out on ftp://.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
(cherry picked from commit 2068c7c6a810cdaf55240faf15c226ce3b308f1b)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/nvidia-driver/nvidia-driver.mk

@@ -6,7 +6,7 @@
 
 NVIDIA_DRIVER_VERSION = 375.20
 NVIDIA_DRIVER_SUFFIX = $(if $(BR2_x86_64),_64)
-NVIDIA_DRIVER_SITE = ftp://download.nvidia.com/XFree86/Linux-x86$(NVIDIA_DRIVER_SUFFIX)/$(NVIDIA_DRIVER_VERSION)
+NVIDIA_DRIVER_SITE = http://download.nvidia.com/XFree86/Linux-x86$(NVIDIA_DRIVER_SUFFIX)/$(NVIDIA_DRIVER_VERSION)
 NVIDIA_DRIVER_SOURCE = NVIDIA-Linux-x86$(NVIDIA_DRIVER_SUFFIX)-$(NVIDIA_DRIVER_VERSION).run
 NVIDIA_DRIVER_LICENSE = NVIDIA Software License
 NVIDIA_DRIVER_LICENSE_FILES = LICENSE