Update media-compat Android.mk to remove deleted directory.
Update media-compat Android.mk to remove deleted directory.

Fixes FindEmulator: find: `frameworks/support/media-compat/jellybean-mr2':
No such file or directory

Test: None
Change-Id: I7be5df47ab9af8ce91c0d88742b51c7f24c2d46a

androidx/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,aosp-mirror/platform_frameworks_support,androidx/androidx,aosp-mirror/platform_frameworks_support,AndroidX/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,aosp-mirror/platform_frameworks_support,AndroidX/androidx,aosp-mirror/platform_frameworks_support,AndroidX/androidx,aosp-mirror/platform_frameworks_support,androidx/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx