Add to call 'partprobe' after 'fdisk' works

Signed-off-by: Dongjin Kim <tobetter@gmail.com>
Change-Id: I86322a3113aa9069587e23788b0d4cb3acfa58e2

overlay/root/firstboot.sh

@@ -17,6 +17,7 @@ lba_finish=$((`fdisk -l ${dev} | grep Disk | grep sectors | awk '{printf $7}'` -
 
 echo -e "p\nd\n2\nn\np\n2\n${lba_start}\n${lba_finish}\np\nw\n" | \
 	fdisk ${dev} >/dev/null
+partprobe
 resize2fs ${rootdev}
 
 rm -f /etc/ssh/ssh_host* && ssh-keygen -A