[small] Fix norm option in config.cmake (#679)

The option name of normalization is not aligned in config.cmake
(`FLASHINFER_NORMALIZATION`) and
[CMakeLists.txt](https://github.com/flashinfer-ai/flashinfer/blob/2bc3214075391c175057302023c4bd99f64b2899/CMakeLists.txt#L44)
(`FLASHINFER_NORM`), so it does not build the test and bench for norm.
This PR changed the option name in config.cmake to `FLASHINFER_NORM` to
align with the option name in CMakeLists.txt.

cmake/config.cmake

@@ -15,7 +15,7 @@ set(FLASHINFER_CASCADE ON)
 # Whether to compile sampling kernel tests/benchmarks or not.
 set(FLASHINFER_SAMPLING ON)
 # Whether to compile normalization kernel tests/benchmarks or not.
-set(FLASHINFER_NORMALIZATION ON)
+set(FLASHINFER_NORM ON)
 # Whether to compile fastdiv tests
 set(FLASHINFER_FASTDIV_TEST ON)
 # Whether to compile fastdequant tests