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f7fd76ad - [attention backends] fix ring CP for flash and flash 3 (#13182)

[attention backends] fix ring CP for flash and flash 3 (#13182) * tests: add cp backend and attention backend tests. * up * up * up * fix ring for flash and flash_3 * generate. * Apply suggestions from code review Co-authored-by: Dhruv Nair <dhruv.nair@gmail.com> * up * up --------- Co-authored-by: Dhruv Nair <dhruv.nair@gmail.com>