Revert "Add updatable-media jarjar rules to framework-all"

We no longer need this jarjar rule because we are not re-compiling
exoplayer.

This reverts commit f92d07e5f9.

Bug: 149906971
Test: m && \
      unzip -l out/soong/.intermediates/frameworks/base/framework-all/\
      android_common/combined/framework-all.jar \
      | grep exo \
      | grep -v internal
      (no exoplayer classes)
Change-Id: Ic4d7847875797be47e02987337bf685bfe1e6605

framework-jarjar-rules.txt

@@ -1,6 +1,2 @@
 rule android.hidl.** android.internal.hidl.@1
 rule android.net.wifi.WifiAnnotations* android.internal.wifi.WifiAnnotations@1
-
-# Hide media mainline module implementation classes to avoid collisions with
-# app-bundled ExoPlayer classes.
-rule com.google.android.exoplayer2.** android.media.internal.exo.@1