Backend: add logical partition block mapper rw support

Thanks LuK1337 & erfanoabdi @ Lineage

META-INF/com/google/android/update-binary

@@ -308,7 +308,7 @@ EOF
 }
 do_modules() {
   test "$(file_getprop anykernel.sh do.modules)" == 1 || return 1;
-  local modcon moddir modtarget module umask;
+  local block modcon moddir modtarget module slot umask;
   if [ "$(file_getprop anykernel.sh do.systemless)" == 1 ]; then
     cd $AKHOME/modules;
     ui_print " " "Creating kernel helper Magisk module...";
@@ -331,6 +331,13 @@ do_modules() {
   else
     cd $AKHOME/modules;
     ui_print " " "Pushing modules...";
+    if [ -d /dev/block/mapper ]; then
+      for block in system vendor; do
+        for slot in "" _a _b; do
+          $BB blockdev --setrw /dev/block/mapper/$block$slot 2>/dev/null;
+        done;
+      done;
+    fi;
     if [ ! -d /postinstall/tmp ]; then
       $BB mount -o rw,remount -t auto /system;
       $BB mount -o rw,remount -t auto /vendor 2>/dev/null;