sd-image-*: Include profiles/base.nix

This brings useful goodies like lspci and lsusb that were missing
previously.

+1
nixos/modules/installer/cd-dvd/sd-image-aarch64.nix
···
in
{
imports = [
+
../../profiles/base.nix
../../profiles/installation-device.nix
./sd-image.nix
];
+1
nixos/modules/installer/cd-dvd/sd-image-armv7l-multiplatform.nix
···
in
{
imports = [
+
../../profiles/base.nix
../../profiles/installation-device.nix
./sd-image.nix
];
+1
nixos/modules/installer/cd-dvd/sd-image-raspberrypi.nix
···
in
{
imports = [
+
../../profiles/base.nix
../../profiles/installation-device.nix
./sd-image.nix
];