Remove earlier added release notes which patches got reverted
Remove earlier added release notes which patches got reverted

Since the patches of LE-8791 and LE-8997 got reverted on 20.04-release, their
release note contents are removed in this patch accordingly as well.

Resolves: LE-13892
Change-Id: Ia30cb833a616a7f6d3733bc61b38ec27e7eee7b0

legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af