fai: remove INSTALLER support

We no longer do, nor want to produce debian installer images like
we've done in the past. Let's remove the support completely.

Signed-off-by: Nicolas Dechesne <nicolas.dechesne@linaro.org>
Change-Id: Ibb0d92f2d1af05c52ea9b493c68c2ce6546fa0eb
diff --git a/disk_config/INSTALLER b/disk_config/INSTALLER
deleted file mode 100644
index 5fa865b..0000000
--- a/disk_config/INSTALLER
+++ /dev/null
@@ -1,7 +0,0 @@
-# config for a disk image for a VM
-#
-# <type> <mountpoint> <size>   <fs type> <mount options> <misc options>
-
-disk_config disk1 disklabel:msdos bootable:1 fstabkey:uuid align-at:1M
-
-primary /      300-      ext4  rw,barrier=0,noatime,errors=remount-ro tuneopts="-c 0 -i 0" createopts="-F"  
diff --git a/package_config/INSTALLER b/package_config/INSTALLER
deleted file mode 100644
index 2dd91ff..0000000
--- a/package_config/INSTALLER
+++ /dev/null
@@ -1,17 +0,0 @@
-PACKAGES install-norec
-96boards-installer-session
-grub-common
-grub-efi-arm64
-kpartx
-libgl1-mesa-dri
-libgl1-mesa-glx
-lightdm
-mesa-utils
-network-manager
-simg2img
-x11-utils
-x11-xserver-utils
-xinit
-xserver-xorg
-xserver-xorg-input-evdev
-xserver-xorg-video-fbdev
diff --git a/scripts/QCOM/21-customize b/scripts/QCOM/21-customize
index b5e6210..1bc0c5e 100755
--- a/scripts/QCOM/21-customize
+++ b/scripts/QCOM/21-customize
@@ -8,16 +8,6 @@
 # Add symlink to trigger systemd start of ttyMSM0 console
 ln -sf "/lib/systemd/system/serial-getty@.service" "$target/etc/systemd/system/getty.target.wants/serial-getty@${SERIAL_CONSOLE}.service"
 
-if ifclass INSTALLER; then
-    # no need to resize rootfs for SD card boot
-    rm -f $target/lib/systemd/system/resize-helper.service
-
-    # needed by GUI installer
-    cat << EOF >> $target/etc/fstab
-/dev/mmcblk1p9 /mnt vfat defaults 0 0
-EOF
-fi
-
 # Add tsched=0 on module-udev-detect to fix distorted sound
 sed -i "s|^load-module module-udev-detect|load-module module-udev-detect tsched=0|" $target/etc/pulse/default.pa