layerscape: ls1012afrdm: convert image to squashfs

This commit replaces UBIFS root partition with squashfs+overlay. It's
preparation for introducing dynamic partitioning.

Signed-off-by: Tomasz Maciej Nowak <tomek_n@o2.pl>

package/boot/uboot-layerscape/files/ls1012afrdm-uEnv.txt

@@ -3,6 +3,6 @@ loadaddr=0x81000000
 fdt_high=0xffffffffffffffff
 initrd_high=0xffffffffffffffff
 qspi_boot=sf probe 0:0;sf read $fdtaddr f00000 100000;sf read $loadaddr 1000000 1000000;bootm $loadaddr - $fdtaddr
-bootargs=ubi.mtd=8 root=ubi0:rootfs rw rootfstype=ubifs noinitrd earlycon=uart8250,mmio,0x21c0500 console=ttyS0,115200 mtdparts=1550000.quadspi:1m(bl2),4m(fip),1m(u-boot-env),4m(reserved-1),3m(pfe),2m(reserved-2),1m(dtb),16m(kernel),32m(ubifs)
+bootargs=rootfstype=squashfs,jffs2 noinitrd earlycon=uart8250,mmio,0x21c0500 console=ttyS0,115200 mtdparts=1550000.quadspi:1m(bl2),4m(fip),1m(u-boot-env),4m(reserved-1),3m(pfe),2m(reserved-2),1m(dtb),16m(kernel),32m(rootfs)
 bootcmd=echo starting OpenWrt ...;pfe stop;run qspi_boot
 bootdelay=3

target/linux/layerscape/image/armv8_64b.mk

@@ -23,9 +23,8 @@ define Device/ls1012afrdm
     tfa-ls1012afrdm \
     kmod-ppfe
   DEVICE_DTS := freescale/fsl-ls1012a-frdm
-  UBINIZE_OPTS := -E 5
   BLOCKSIZE := 256KiB
-  PAGESIZE := 1
+  FILESYSTEMS := squashfs
   IMAGE/firmware.bin := \
     ls-clean | \
     ls-append $(1)-bl2.pbl | pad-to 1M | \
@@ -34,7 +33,7 @@ define Device/ls1012afrdm
     ls-append pfe.itb | pad-to 15M | \
     ls-append-dtb $$(DEVICE_DTS) | pad-to 16M | \
     append-kernel | pad-to 32M | \
-    append-ubi | check-size 67108865
+    append-rootfs | pad-rootfs | check-size 67108865
   KERNEL_INITRAMFS := kernel-bin | fit none $$(DTS_DIR)/$$(DEVICE_DTS).dtb
 endef
 TARGET_DEVICES += ls1012afrdm