dt-bindings: virtio: Replace HTTP links with HTTPS ones

Rationale:
Reduces attack surface on kernel devs opening the links for MITM
as HTTPS traffic is much harder to manipulate.

Deterministic algorithm:
For each file:
  If not .svg:
    For each line:
      If doesn't contain `\bxmlns\b`:
        For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`:
	  If neither `\bgnu\.org/license`, nor `\bmozilla\.org/MPL\b`:
            If both the HTTP and HTTPS versions
            return 200 OK and serve the same content:
              Replace HTTP with HTTPS.
Signed-off-by: Alexander A. Klimov <grandmaster@al2klimov.de>
Link: https://lore.kernel.org/r/20200709064755.24051-1-grandmaster@al2klimov.deSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/virtio/mmio.txt

 * virtio memory mapped device
 
-See http://ozlabs.org/~rusty/virtio-spec/ for more details.
+See https://ozlabs.org/~rusty/virtio-spec/ for more details.
 
 Required properties: