add blockdev calls for RW system

EXPERIMENTAL

phh-securize.sh

@@ -12,6 +12,11 @@ do
     [ -d $MOUNTPOINT ] && mountpoint -q $MOUNTPOINT && break
 done
 
+#experimental
+blockdev --setrw /dev/block/mapper/system
+blockdev --setrw /dev/block/by-name/system_a
+blockdev --setrw /dev/block/by-name/system_b
+
 mount -o remount,rw $MOUNTPOINT
 remount
 

rw-system.sh

@@ -266,6 +266,11 @@ if [ "$(getprop ro.product.vendor.manufacturer)" = motorola ] && getprop ro.vend
     setprop persist.sys.overlay.devinputjack true
 fi
 
+#experimental
+blockdev --setrw /dev/block/mapper/system
+blockdev --setrw /dev/block/by-name/system_a
+blockdev --setrw /dev/block/by-name/system_b
+
 if mount -o remount,rw /system; then
     resize2fs "$(grep ' /system ' /proc/mounts | cut -d ' ' -f 1)" || true
 else