poplar: use persistent property to disable or enable adb over usb fun…

…ction

For the requirement of using usb2 port as host mode permanently, it uses
persistent property to disable or enable adb over usb function:
  - disable adb over usb: setprop persist.adb.over.usb 0
  - enable adb over usb: setprop persist.adb.over.usb 1

Signed-off-by: Jianguo Sun <sun_jianguo@hoperun.com>

rootfs/init.poplar.rc

@@ -9,3 +9,8 @@ on fs
  mount_all ./fstab.poplar
  swapon_all ./fstab.poplar
 
+on property:persist.adb.over.usb=0
+ write /sys/kernel/debug/hisi_inno_phy/role "host"
+
+on property:persist.adb.over.usb=1
+ write /sys/kernel/debug/hisi_inno_phy/role "peripheral"