[rocm-libraries] ROCm/rocm-libraries#6983 (commit f4e9a84)

Remove batch_prefill from FMHA_FWD_KNOWN_APIS (#6983)

Remove `batch_prefill` from the `FMHA_FWD_KNOWN_APIS` list in
`projects/composablekernel/example/ck_tile/01_fmha/CMakeLists.txt`.

**Change:**
```cmake
# Before
set(FMHA_FWD_KNOWN_APIS "fwd;fwd_splitkv;fwd_appendkv;pagedkv_prefill;batch_prefill")

# After
set(FMHA_FWD_KNOWN_APIS "fwd;fwd_splitkv;fwd_appendkv;pagedkv_prefill")
```

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Co-authored-by: asleepzzz <hanwen.chang@amd.com>
Co-authored-by: Po Yen Chen <PoYen.Chen@amd.com>