petalinux-initramfs-image.bb: Add initramfs extboot module
petalinux-initramfs-image.bb: Add initramfs extboot module

This patch will add extboot module and few minimal rootfs packages into
petalinux-initramfs-image bb file.
With this we can load initramfs as minimal rootfs and switch to the
actual rootfs file by specifying 'ext4=/dev/mmcblk0p2:/rootfs' in the
kernel bootargs.

Signed-off-by: Raju Kumar Pothuraju <faf499088bbd7c813560772aeae4b5ae1c5f96a7@xilinx.com>
Signed-off-by: Jaewon Lee <1b369288d13b7b5cc9a37dd614e864b90fd18321@xilinx.com>

Xilinx/meta-petalinux,Xilinx/meta-petalinux,Xilinx/meta-petalinux,Xilinx/meta-petalinux,Xilinx/meta-petalinux,Xilinx/meta-petalinux