sd-image-*: Set verbose kernel loglevel

Much easier to debug boot issues this way...

Changed files
+2
nixos
+1
nixos/modules/installer/cd-dvd/sd-image-armv7l-multiplatform.nix
···
boot.kernelPackages = pkgs.linuxPackages_latest;
boot.kernelParams = ["console=ttyS0,115200n8" "console=ttymxc0,115200n8" "console=ttyAMA0,115200n8" "console=ttyO0,115200n8" "console=tty0"];
+
boot.consoleLogLevel = 7;
# FIXME: this probably should be in installation-device.nix
users.extraUsers.root.initialHashedPassword = "";
+1
nixos/modules/installer/cd-dvd/sd-image-raspberrypi.nix
···
boot.loader.generic-extlinux-compatible.enable = true;
boot.kernelPackages = pkgs.linuxPackages_rpi;
+
boot.consoleLogLevel = 7;
# FIXME: this probably should be in installation-device.nix
users.extraUsers.root.initialHashedPassword = "";