修改hi3559 rootfs分区大小配置

Kernel command line: mem=512M console=ttyAMA0,115200 clk_ignore_unused rw rootwait ip=172.16.10.2:::::eth0 root=/dev/mmcblk0p3 rootfstype=ext4 blkdevparts=mmcblk0:1M(u-boot.bin),9M(kernel),7000M(rootfs.ext4)

~ # df -h
Filesystem                Size      Used Available Use% Mounted on
/dev/root                90.5M     58.0M     30.6M  65% /
tmpfs                   242.1M      4.0K    242.1M   0% /dev

修改后：

~ # df -h
Filesystem                Size      Used Available Use% Mounted on
/dev/root                 6.6G    160.8M      6.4G   2% /
tmpfs                   242.1M      4.0K    242.1M   0% /dev