Include misc_info.txt for super.img in dist

Include the misc_info.txt in "dist_files" so we can recreate a new
mixed super image (system and vendor images from different builds)
later in the test pipeline.

The misc_info.txt for products with BOARD_SUPER_IMAGE_IN_UPDATE_PACKAGE
set to true is removed from their update packages (essentially, reverts
aosp/976069) since the super_misc_info.txt created here can be used.

Bug: 139404128
Test: $ lunch aosp_x86-userdebug
      $ m dist
      $ diff $OUT_DIR/dist/super_misc_info.txt $OUT/misc_info.txt

Change-Id: Iad1ff981124a19933b0b575bc99941e0fc3813a7