Revert "product_files: Adjust 'userdata' and 'misc' partition." This reverts commit 3309e4b80efda13cc58db65cc6240ddc7959cdca. There is no need to have 'gvm_' prefix in userdata and misc partitions since COQOS SDK supports virtual GPT [1] now and there is no name clashing anymore. [1]: https://partnerissuetracker.corp.google.com/u/1/issues/182190949 Bug: 196104829 Test: Boot Android to UI Change-Id: I7b18ea32df957f7f19649795e0d2fe78aaaa0bdb